65 (number)
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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:
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Wikipedia