Properties of the Number 12665

Twelve Thousand Six Hundred Sixty-Five

Basics

Value: 12664 → 12665 → 12666

Parity: odd

Prime: No

Previous Prime: 12659

Next Prime: 12671

Digit Sum: 20

Digital Root: 2

Palindrome: No

Factorization: 5 × 17 × 149

Divisors: 1, 5, 17, 85, 149, 745, 2533, 12665

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 11000101111001

Octal: 30571

Duodecimal: 73B5

Hexadecimal: 3179

Square: 160402225

Square Root: 112.53888216967503

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

Sums of the antidiagonals of the table of k-almost primes (A078840). A78842

Positive numbers y such that y² is of the form x²+(x+23)² with integer x. A156567

Pisot sequences E(5,7), P(5,7). A20711

a(n) = 6·a(n-1)-a(n-2) for n > 2; a(1)=17, a(2)=65. A156570

Principal diagonal of the convolution array A213778. A213779

Pisot sequences E(7,10), P(7,10). A20721

Number of torsion pairs in the cluster category of type A_n. A181517

Numbers k such that A084937(3k) > A084937(3k+1). A249689

The values of c in a² + b² = c² where b - a = 23 and gcd(a,b,c) = 1. A117475

a(n) = 2·a(n-1) + a(n-2) + n. A117585