66 (number)
Natural number
From Wikipedia, the free encyclopedia
66 (sixty-six) is the natural number following 65 and preceding 67.
| ||||
|---|---|---|---|---|
| Cardinal | sixty-six | |||
| Ordinal | 66th (sixty-sixth) | |||
| Factorization | 2 × 3 × 11 | |||
| Divisors | 1, 2, 3, 6, 11, 22, 33, 66 | |||
| Greek numeral | ΞϚ´ | |||
| Roman numeral | LXVI, lxvi | |||
| Binary | 10000102 | |||
| Ternary | 21103 | |||
| Senary | 1506 | |||
| Octal | 1028 | |||
| Duodecimal | 5612 | |||
| Hexadecimal | 4216 | |||
In mathematics
66 is a sphenic number, a semiperfect number,[1] and a Erdős–Woods number.[2] It is also the 11th triangular number[3] and the 6th hexagonal number.[4]
