666 (number) facts for kids
Quick facts for kids



Cardinal  six hundred and sixtysix  
Ordinal  666th (six hundred and sixtysixth) 

Factorization  2 · 3^{2}· 37  
Roman numeral  DCLXVI  
Binary  1010011010_{2}  
Ternary  220200_{3}  
Quaternary  22122_{4}  
Quinary  10131_{5}  
Senary  3030_{6}  
Octal  1232_{8}  
Duodecimal  476_{12}  
Hexadecimal  29A_{16}  
Vigesimal  1D6_{20}  
Base 36  II_{36} 
666 is a natural number after 665 and before 667. It is a number with many properties. One of these properties is that it is the sum of the first 36 natural numbers. That makes 666 a triangular number. 666 is the sum of the first 144 decimals (digits after the decimal point) of pi. The number is also used in the 666 dating rule or rule of sixes which judges the attractiveness of men.
The Bible says in the Book of Revelation that the number 666 is associated with an Antichrist, so the number is the "Number of the Beast". Some interpreters say that a future world leader will force people to accept this number as a mark or else be forbidden to buy or sell. However, people who do accept this mark will be rejected by God. Another interpretation notes that in the Aramaic alphabet each letter has a numeric value, the letters in each name or title can be added to produce a total. Some think the name of the Emperor Nero was secretly referred to by this number, since Nero did much to harm Christians. The name of Nero Caesar in Aramaic adds up to 666.
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666 is often associated with the devil.