Properties of the Number -6665

Six Hundred Sixty-Five

Basics

Value: -6666 → -6665 → -6664

Parity: odd

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 23

Digital Root: 5

Palindrome: No

Factorization: 5 × 31 × 43

Divisors: 1, 5, 31, 43, 155, 215, 1333, 6665

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: -1101000001001

Octal: -15011

Duodecimal: -3A35

Hexadecimal: -1a09

Square: 44422225

Square Root: 81.6394512475433

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

a(n) = (1 - (-6)ⁿ)/7. A14987

Triangle of q-binomial coefficients for q=-6. A15116

Expansion of (η(q)*η(q³))/η(q²)² in powers of q. A293306

Gaussian binomial coefficient [ n,5 ] for q = -6. A15310

Centered tetrahedral numbers. A5894

RMS numbers: numbers n such that root mean square of divisors of n is an integer. A140480

Numbers which have only digits 5 and 6 in base 10. A256291

Number of integer partitions of n with a different mean, median, and mode, assuming there is a unique mode. A363725

Beastly (or hateful) numbers: numbers containing the string 666 in their decimal expansion. A51003

a(n) = 5·a(n-1) + 6·a(n-2), a(0) = 0, a(1) = 1. A15540