High Quality Content by WIKIPEDIA articles! 666 is the natural number following 665 and preceding 667. It is also an abundant number. It is the sum of the first 36 natural numbers (i.e. ), and thus a triangular number. Since 36 is both square and triangular, 666 is the sixth number of the form (sequence A037270 in OEIS) and the eighth number of the form (doubly triangular numbers). The number of prime numbers up to 666 is 121, the square of the number of prime numbers up to 36. 666 is the 60th 12-factored number; 60 is the first 12-factored number. In the Bible, the Book of Revelation (13:17-18) cryptically asserts 666 to be "the number of a man," associated with the beast, an antagonistic creature that appears briefly about two-thirds into the apocalyptic vision. The calculation of the number was a challenge that has inspired many would-be mystics and prophets ever since.

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