Back 666 (عدد) Arabic 666 (ədəd) Azerbaijani 666 (число) Bulgarian ৬৬৬ (সংখ্যা) Bengali/Bangla ٦٦٦ (ژمارە) CKB 666 (číslo) Czech 666 (rhif) Welsh 666 (αριθμός) Greek 666 (nùmer) EML 666 (number) English
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|---|---|---|---|---|
| Cardinal | six hundred sixty-six | |||
| Ordinal | 666th (six hundred sixty-sixth) | |||
| Factorization | 2 × 32× 37 | |||
| Greek numeral | ΧΞϚ´ | |||
| Roman numeral | DCLXVI | |||
| Binary | 10100110102 | |||
| Ternary | 2202003 | |||
| Quaternary | 221224 | |||
| Quinary | 101315 | |||
| Senary | 30306 | |||
| Octal | 12328 | |||
| Duodecimal | 47612 | |||
| Hexadecimal | 29A16 | |||
| Vigesimal | 1D620 | |||
| Base 36 | II36 | |||
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.[1] The number is also used in the 666 dating rule or rule of sixes which judges the attractiveness of men.
- ↑ Alfred S. Posamentier and Ingmar Lehmann 2009. Mathematical Amazements and Surprises: Fascinating Figures and Noteworthy Numbers. ISBN 978-1-5910-2723-2.