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Cardinal | sixty-five | |||
Ordinal | 65th (sixty-fifth) |
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Factorization | 5 × 13 | |||
Divisors | 1, 5, 13, 65 | |||
Roman numeral | LXV | |||
Binary | 10000012 | |||
Ternary | 21023 | |||
Quaternary | 10014 | |||
Quinary | 2305 | |||
Senary | 1456 | |||
Octal | 1018 | |||
Duodecimal | 5512 | |||
Hexadecimal | 4116 | |||
Vigesimal | 3520 | |||
Base 36 | 1T36 |
65 (sixty-five) is the natural number following 64 and preceding 66.
Sixty-five is the 23rdsemiprime and the 3rd of the form (5.q). It is an octagonal number. It is also a Cullen number. Given 65, the Mertens function returns 0.
Sixty-five has an aliquot sum of 19 and is the first composite number in the 19-aliquot tree.
This number is the magic constant of 5 by 5 normal magic square: