666 (number)

For the year 666 AD, see 666.
665 666 667
Cardinal six hundred sixty-six
Ordinal 666th
(six hundred and sixty-sixth)
Factorization 2 × 32× 37
Roman numeral DCLXVI
Binary 10100110102
Ternary 2202003
Quaternary 221224
Quinary 101315
Senary 30306
Octal 12328
Duodecimal 47612
Hexadecimal 29A16
Vigesimal 1D620
Base 36 II36
Greek numeral χξϛʹ[1]
Chinese numeral 六百六十六
Arabic numeral ٦٦٦

666 (six hundred sixty-six) is the natural number following 665 and preceding 667.

Six hundred and sixty-six is called the "number of the Beast" in (most manuscripts of) chapter 13 of the Book of Revelation, of the New Testament,[2] and also in popular culture.

In mathematics

666 is the sum of the first 36 natural numbers (, i.e. 1 + 2 + 3 + ... + 34 + 35 + 36 = 666), and thus it is a triangular number. Notice that 36 = 15 + 21; 15 and 21 are also triangular numbers; and 152 + 212 = 225 + 441 = 666.

In base 10, 666 is a repdigit (and therefore a palindromic number) and a Smith number. A prime reciprocal magic square based on 1/149 in base 10 has a magic total of 666.

The prime factorization of 666 is 2 • 32 • 37. Also, 666 is the sum of squares of first seven primes:

The Roman numeral for 666, DCLXVI, has exactly one occurrence of all symbols whose value is less than 1000 in decreasing order (D = 500, C = 100, L = 50, X = 10, V = 5, I = 1).

In religion

Number of the Beast

666 is often associated with the devil.
Main article: Number of the Beast

In the Textus Receptus manuscripts of the New Testament, the Book of Revelation (13:17–18) cryptically asserts 666 to be "man's number" or "the number of a man" (depending on how the text is translated) associated with the Beast, an antagonistic creature that appears briefly about two-thirds into the apocalyptic vision. Some manuscripts of the original Greek use the symbols χξϛ chi xi stigma (or ϝ digamma), while other manuscripts spell out the number in words.

In modern popular culture, 666 has become one of the most widely recognized symbols for the Antichrist or, alternatively, the devil. The number 666 is purportedly used to invoke Satan. Earnest references to the number occur both among apocalypticist Christian groups and in explicitly anti-Christian subcultures. References in contemporary Western art or literature are, more likely than not, intentional references to the Beast symbolism. Such popular references are therefore too numerous to list.

It is common to see the symbolic role of the integer 666 transferred to the digit sequence 6-6-6. Some people take the Satanic associations of 666 so seriously that they actively avoid things related to 666 or the digits 6-6-6. This is known as hexakosioihexekontahexaphobia.

In some early biblical manuscripts, the number is cited as 616.[3]

Other occurrences

In other fields

666 float in a Paris parade

See also


  1. "Revelation 13:18". Stephanus New Testament. Bible Gateway. Retrieved 2006-06-22.
  2. Beale, Gregory K. (1999). The Book of Revelation: A Commentary on the Greek Text. Grand Rapids, Michigan: Wm. B. Eerdmans Publishing. p. 718. ISBN 080282174X. Retrieved 9 July 2012.
  3. Novum Testamentum Graece, Nestle and Aland, 1991, footnote to verse 13:18 of Revelation, page 659: "-σιοι δέκα ἕξ" as found in C [C=Codex Ephraemi Rescriptus]; for English see Metzger's Textual Commentary on the Greek New Testament, note on verse 13:18 of Revelation, page 750: "the numeral 616 was also read ..."
  4. Schwartz, Erich D. "God’s Principles of Mathematics as Revealed in Scripture." Mountville, PA: Dayspring Christian Academy, 2000.
  5. 1 2 666 – professors explain Roulette and Nero in detail; numberphile.com
  6. May, Steve. "The Devil Made Him Do It and Left Me There, Comfortable". The New Yinzer. Retrieved 2009-09-13.
  7. Mah, Adeline Yen (2009). China: Land of Dragons and Emperors. ISBN 0375890998. Retrieved 2013-12-07.
  8. "Know the Meaning of Numbers in Chinese Culture". Retrieved 2014-10-30.
  9. "666 – Good day, bad day or just another day?". Retrieved 2014-10-30.

External links

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