666 (number)

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

665 666 667
Cardinalsix hundred sixty-six
Ordinal666th
(six hundred sixty-sixth)
Factorization2 × 32 × 37
Divisors1, 2, 3, 6, 9, 18, 37, 74, 111, 222, 333, 666
Greek numeralΧΞϚ´
Roman numeralDCLXVI
Greek prefixἑξακόσιοι ἑξήκοντα ἕξ
hexakósioi hexēkonta héx
Latin prefixsescenti sexaginta sex
Binary10100110102
Ternary2202003
Senary30306
Octal12328
Duodecimal47612
Hexadecimal29A16
Chinese numeral六百六十六
Devanagari numeral६६६

In Christianity, 666 is referred to in (most manuscripts of) chapter 13 of the Book of Revelation of the New Testament as the "number of the beast."

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