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# The Number 666: Properties and Meanings

Prime Factors of

**666**=

2x

3x

3x

37.

**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: (

15x

15) + (

21x

21).

**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.