165 (one hundred [and] sixty-five) is the natural number following 164 and preceding 166.
| ||||
|---|---|---|---|---|
| Cardinal | one hundred sixty-five | |||
| Ordinal | 165th (one hundred sixty-fifth) | |||
| Factorization | 3 × 5 × 11 | |||
| Divisors | 1, 3, 5, 11, 15, 33, 55, 165 | |||
| Greek numeral | ΡΞΕ´ | |||
| Roman numeral | CLXV, clxv | |||
| Binary | 101001012 | |||
| Ternary | 200103 | |||
| Senary | 4336 | |||
| Octal | 2458 | |||
| Duodecimal | 11912 | |||
| Hexadecimal | A516 | |||
In mathematics
edit165 is:
- an odd number, a composite number, and a deficient number.
- a sphenic number.
- a tetrahedral number.[1]
- the number of prime knots with 10 crossings.[2]
- the sum of the sums of the divisors of the first 14 positive integers.[3]
- a self number in base 10.
- a palindromic number in binary (101001012) and bases 14 (BB14), 32 (5532) and 54 (3354).
- a unique period in base 2.
References
edit- ^ "Sloane's A000292 : Tetrahedral numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-28.
- ^ Sloane, N. J. A. (ed.). "Sequence A002863 (Number of prime knots with n crossings)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
- ^ Sloane, N. J. A. (ed.). "Sequence A024916 (sum_{k=1..n} sigma(k) where sigma(n) = sum of divisors of n)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
External links
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