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# The Number 666: Properties and Meanings

Prime Factors of**666**=2x3x3x37.

**666**is a Triangular Number.

**666**is a 223-gonal Number.

342=

**666**in base 7.

**666**lists in their proper order the letters used for numbers in Roman numeration system, namely D (500) + C (100) + L (50) + X (10) + V (5) + I (1), or DCLXVI.

**666**is the sum of the squares of two consecutive Triangular Numbers: (15x15) + (21x21).

**666**is the sum of two consecutive palindromic primes 313 + 353.

In the King James Version of the Bible, 'Revelation 13:18': "Here is wisdom: let him who hath understanding count the number of the beast: for it is the number of a man; and his number is '

**six hundred three score and six**'.

### The Year 666 AD

The year**666**AD was at one time considered the date for the advent of the Antichrist.

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