Properties of the Number -2660

Six Hundred Sixty

Basics

Value: -2661 → -2660 → -2659

Parity: even

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 14

Digital Root: 5

Palindrome: No

Factorization: 2 ² × 5 × 7 × 19

Divisors: 1, 2, 4, 5, 7, 10, 14, 19, 20, 28

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: -101001100100

Octal: -5144

Duodecimal: -1658

Hexadecimal: -a64

Square: 7075600

Square Root: 51.57518783291051

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

Exponential Riordan array [exp(x·exp(-x)),x]. A215652

Matrix inverse of A100862. A107102

Expansion of φ(-q²) / φ(-q³) in powers of q where φ() is a Ramanujan θ function. A262967

G.f.: 1 + (1·x)/(1 + (2·x)²/(1 + (3·x)³/(1 + (4·x)⁴/(1 + (5·x)⁵/(1 + ...))))). A343473

First differences of number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 163", based on the 5-celled von Neumann neighborhood. A270456

Triangle T(n,k) which contains 16·n!*2^floor((n+1)/2) times the coefficient [tⁿ x^k] exp(t·x)/(15 + exp(8·t)) in row n, column k. A171685

a(n) = binomial(n+3, 3)/4 for odd n, n*(n+2)*(n+4)/24 for even n. A6918

a(n) = 2·binomial(n,3). A7290

Triangle read by rows, the Bell transform of the triple factorial numbers A007559(n+1) without column 0. A35469

a(n) = floor(n*φ⁹), where φ is the golden ratio, A001622. A4924