Properties of the Number -2665

Six Hundred Sixty-Five

Basics

Value: -2666 → -2665 → -2664

Parity: odd

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 19

Digital Root: 1

Palindrome: No

Factorization: 5 × 13 × 41

Divisors: 1, 5, 13, 41, 65, 205, 533, 2665

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: -101001101001

Octal: -5151

Duodecimal: -1661

Hexadecimal: -a69

Square: 7102225

Square Root: 51.62363799656123

Classification

Fibonacci: No

Bell Number: No

Factorial Number: No

Regular Number: No

Perfect Number: No

Special

Kaprekar Constant: No

Munchausen Constant: No

Armstrong Number: No

Kaprekar Number: No

Catalan Number: No

Vampire Number: No

Taxicab Number: No

Super Prime: No

Friedman Number: No

Fermat Number: No

Cullen Number: No

OEIS Sequences

Expansion of (ψ(x) / φ(x))⁵ in powers of·where φ(), ψ() are Ramanujan θ functions. A195861

a(n+1) = a(n) - n (if n is even), a(n+1) = a(n) * n (if n is odd). A47907

Expansion of e.g.f. sinh(log(1+x)/exp(x)). A9584

Numerator of Bernoulli(n, -3/7). A158518

First differences of number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 205", based on the 5-celled von Neumann neighborhood. A270732

Centered square numbers: a(n) = 2·n*(n+1)+1. Sums of two consecutive squares. Also, consider all Pythagorean triples (X, Y, Z=Y+1) ordered by increasing Z; then sequence gives Z values. A1844

a(n) = number of partitions of n into parts of 2 kinds. A712

Pseudoprimes to base 3. A5935

Numbers whose base-2 representation is the juxtaposition of two identical strings. A20330

a(n) = n*(3·n + 7)/2. A140090