What is a nasty number?

A "nasty number" is a positive integer with at least four distinct factors, where the difference between one pair of factors equals the sum of another pair, for example, 6 (since 6 − 1 = 2 + 3 6 − 1 = 2 + 3) or 24 (since 12 − 2 = 4 + 6 1 2 − 2 = 4 + 6). This property links to recreational mathematics and computer science problems, with numbers like 6 𝑘 6 𝑘 (where 𝑘 𝑘 is a square) also forming nasty numbers, according to IOPscience.
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What is the most evil number?

The "most evil number" is widely considered to be 666, known as the "Number of the Beast" from the Book of Revelation in the Bible, symbolizing evil, the Antichrist, and Satan. While 666 holds strong negative connotations in Western culture, other numbers, like 4 in East Asia (sounds like death) or 39 in Afghanistan (slang for pimp), are considered unlucky or "evil" in different cultures due to language or superstition, notes The Evil Wiki and National Geographic. 
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Why is 52 an untouchable number?

52 is an "untouchable number" in mathematics because no matter which positive integer you pick, the sum of its proper divisors (divisors excluding the number itself) will never equal 52, placing it in a rare group with 2, 5, 88, and others that can't be reached by the aliquot sum function. It's a number that "can't be touched" by this specific divisor-sum process, unlike most numbers that eventually appear in these sequences, say Reddit users. 
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What is the most disliked number?

There's no single "most hated number," but 13 (due to triskaidekaphobia and Friday the 13th), 666 (the "number of the beast"), and culturally specific numbers like 39 (Afghanistan, meaning "pimp") or 4 (East Asia, sounds like death) are widely disliked or feared, often tied to superstitions or historical events. Personal experiences also create hated numbers, like age or dates of tragedy. 
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Is 69 a bad luck number?

No, 69 isn't universally a bad luck number; it carries varied meanings, often seen as positive for balance, transformation, and love in numerology and spirituality, symbolizing harmony and new beginnings, but its strong association with a sexual act makes some avoid it in formal settings, while in sports, its sexual connotation has led to it being unofficially banned, as seen with the NBA. 
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Nasty Number

Is there a bad luck number?

According to global superstitions, the unluckiest numbers are 12, 17, 13 and 666. The Japanese culture also believes some ages to be unlucky including 25, 42 and 60.
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What did *69 mean?

\*69 (Star 69) is a telephone service code, primarily in North America, that automatically calls back the last number that called you, allowing you to connect with someone even if you missed the call or their number was private (as long as they didn't block it from *69). It's a "call return" feature, distinct from *67, which blocks your number for an outgoing call. 
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What is this number 1000000000000000000000000?

Quintillion is the denomination used for large numbers. A quintillion is the number name for 10 raised to the power of 18, that is, one followed by 18 zeros. In the International numeral system, a quintillion has 6 groups of zeros in 3, that is, 1,000,000,000,000,000,000.
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Why is 13 called Devil's number?

In Christianity, the Last Supper is a well-known event where Judas Iscariot, the disciple who betrayed Jesus, was the 13th guest. This association with betrayal and misfortune has contributed to the negative connotations of the number 13.
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Is 12345678910987654321 a prime number?

The number 12,345,678,910,987,654,321 is indeed prime. It consists of 20 digits and is really easy to remember: count to 10 and then count backward again until you get to 1. But it has been unclear whether other primes take the palindromic form of starting at 1, ascending to the number n and then descending again.
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Why is the number 70 weird?

The smallest weird number is 70. Its proper divisors are 1, 2, 5, 7, 10, 14, and 35; these sum to 74, but no subset of these sums to 70. The number 12, for example, is abundant but not weird, because the proper divisors of 12 are 1, 2, 3, 4, and 6, which sum to 16; but 2 + 4 + 6 = 12.
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What is a wicked number?

sum to 666 is known as an evil number (Pegg and Lomont 2004). However, the term "evil" is also used to denote nonnegative integers that have an even number of 1s in their binary expansions, the first few of which are 0, 3, 5, 6, 9, 10, 12, 15, 17, 18, 20, ...
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What numbers should I not call?

You should never call unknown numbers due to scam risks, but urban legends also point to numbers like Bulgaria's 0888 888 888 (linked to deaths) or the cursed 666-666-666, and haunted numbers from horror stories like 999-9999, which are popular in scary stories and folklore, though these are typically disconnected or lead to automated messages. 
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Is 666 actually evil?

Yes, 666 is widely considered a "bad" or negative number due to its association with the "number of the beast" in the biblical Book of Revelation, symbolizing evil, the Antichrist, and opposition to God, but its meaning is rooted in numerology (like gematria) often linked to figures like Emperor Nero, not inherently evil in all contexts, with some modern interpretations seeing it as a call to focus on spiritual matters rather than worldly problems. 
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Is 444 a devil or angel number?

If you believe in signs and angel numbers; 444 signifies divine support and guidance. It's a message to build a strong foundation, take decisive action and have faith in the path you wondering to follow or not.
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Who is 666 in the Bible?

In the Bible, specifically the Book of Revelation (Chapter 13:18), 666 is the "number of the beast," a code for a specific person, widely interpreted by scholars as Emperor Nero or a symbol of imperfect humanity/evil, calculated through gematria (letter-to-number values) from his name, signifying ultimate opposition to God. It's linked to the Antichrist figure, representing complete failure compared to God's perfect "7," but the exact identity remains a mystery intended to call for wisdom, not just a puzzle.
 
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Why is 13 a creepy number?

People fear the number 13, known as triskaidekaphobia, primarily due to ancient religious and mythological stories, particularly linking it to the 13 guests at the Last Supper (Judas being the betrayer) and Norse myth where Loki was the 13th guest at a feast, leading to Balder's death. These stories, combined with the number's contrast to the "perfect" 12 (months, apostles, etc.) and its frequent association with misfortune in media, solidified it as a cultural superstition in the West, despite its positive connotations in some cultures like the Maya.
 
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Is 170141183460469231731687303715884105727 prime number?

Using this algorithm with hand computations on paper, Lucas showed in 1876 that the 39-digit number (2127 – 1) equals 170,141,183,460,469,231,731,687,303,715,884,105,727, and that value is prime. Also known as M127, this number remains the largest prime verified by hand computations.
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How big is a sextillion?

A sextillion is a massive number, equal to 1 followed by 21 zeros (1,000,000,000,000,000,000,000) in the common short scale used in the US and modern finance, or 1 followed by 36 zeros (10^36) in the long scale used in some European countries, making the short scale sextillion much smaller but the more familiar figure in everyday contexts like science and economics. 
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Is 1 octillion a number?

Yes, 1 octillion is a very large number, representing 1 followed by 27 zeros (1,000,000,000,000,000,000,000,000,000) in the short scale used in the US and modern Britain, or 1 followed by 48 zeros in the long scale used historically in Britain and Europe. It's part of the naming system for huge quantities, like million, billion, trillion, and beyond. 
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What is 69 for kids?

For upper elementary or lower middle school, we often say “a slang term for a sex act" or ”a sex position some adults do.” In middle school classrooms, we might also explain the connection to the numbers by saying “a sex position some adults do that makes their bodies look like a 6 & a 9.”
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Why is 69 a dirty number?

69 is slang for when two partners arrange their bodies to perform oral sex on one another at the same time in a way said to look like the number 69.
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Should I use *67 or *69?

*67 is used to block your caller ID, while *69 lets you automatically call back the last number that contacted you, even if you don't know their number.
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