165 (number)

← 164 165 166 →
← 160 161 162 163 164 165 166 167 168 169 → List of numbers Integers ← 0 100 200 300 400 500 600 700 800 900 →
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

165 (one hundred [and] sixty-five) is the natural number following 164 and preceding 166.

In mathematics

165 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

1. "Sloane's A000292 : Tetrahedral numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-28.
2. Sloane, N. J. A. (ed.). "SequenceA002863(Number of prime knots with n crossings)". The On-Line Encyclopedia of Integer Sequences . OEIS Foundation.
3. Sloane, N. J. A. (ed.). "SequenceA024916(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

• Number Facts and Trivia: 165
• The Number 165
• The Positive Integer 165
• VirtueScience: 165 Archived 2021-01-21 at the Wayback Machine