The occult ``number of the beast'' associated in the Bible with the Antichrist. It has figured in many numerological studies. It is mentioned in Revelation 13:18: ``Here is wisdom. Let him that hath understanding count the number of the beast: for it is the number of a man; and his number is 666.''

The beast number has several interesting properties which numerologists may find particularly interesting (Keith 1982-83).
In particular, the beast number is equal to the sum of the squares of the first 7 Primes

(1) |

(2) |

(3) |

(4) |

(5) | |||

(6) |

(Keith). 666 is a Repdigit, and is also a Triangular Number

(7) |

A number of the form which contains the digits of the beast number ``666'' is called an Apocalyptic Number, and a number having 666 digits is called an Apocalypse Number.

**References**

Bellew, D. W. and Weger, R. C. ``Repdigit Triangular Numbers.'' *J. Recr. Math.* **8**, 96-97, 1975-76.

Blatner, D. *The Joy of Pi.* New York: Walker, back jacket, 1997.

Castellanos, D. ``The Ubiquitous .'' *Math. Mag.* **61**, 153-154, 1988.

Hardy, G. H. *A Mathematician's Apology, reprinted with a foreword by C. P. Snow.*
New York: Cambridge University Press, p. 96, 1993.

Keith, M. ``The Number of the Beast.'' http://users.aol.com/s6sj7gt/mike666.htm.

Keith, M. ``The Number 666.'' *J. Recr. Math.* **15**, 85-87, 1982-1983.

© 1996-9

1999-05-26