Properties of the Number 15666

Fifteen Thousand Six Hundred Sixty-Six

Basics

Value: 15665 → 15666 → 15667

Parity: even

Prime: No

Previous Prime: 15661

Next Prime: 15667

Digit Sum: 24

Digital Root: 6

Palindrome: No

Factorization: 2 × 3 × 7 × 373

Divisors: 1, 2, 3, 6, 7, 14, 21, 42, 373, 746

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

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Representations

Binary: 11110100110010

Octal: 36462

Duodecimal: 9096

Hexadecimal: 3d32

Square: 245423556

Square Root: 125.16389255691915

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

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

Number of free pure symmetric multifunctions with leaves a multiset whose multiplicities are the integer partition with Heinz number n. A317655

a(n) = n! * [xⁿ] exp(n·x)/(2 - exp(x)). A292916

Numbers with exactly 4 distinct palindromic prime factors. A46402

Number of character table entries of the symmetric group S_n which are < 0. A51748

a(n) = ∑_k=1..n k² * n^n-k. A368524

6 times centered hexagonal numbers: 18·n*(n+1) + 6. A164016

Numbers n such that A002088(n) < 3n²/π². A285022

Square array A(n, k) read by descending antidiagonals, where column k is the expansion of the e.g.f. exp(k·x)/(2 - exp(x)). A292915

a(n) = (n+(n+1)) + (n*(n+1)) + (nⁿ⁺¹). A138748