Properties of the Number 66939

Sixty-Six Thousand Nine Hundred Thirty-Nine

Basics

Value: 66938 → 66939 → 66940

Parity: odd

Prime: No

Previous Prime: 66931

Next Prime: 66943

Digit Sum: 33

Digital Root: 6

Palindrome: No

Factorization: 3 × 53 × 421

Divisors: 1, 3, 53, 159, 421, 1263, 22313, 66939

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 10000010101111011

Octal: 202573

Duodecimal: 328A3

Hexadecimal: 1057b

Square: 4480829721

Square Root: 258.7257234988435

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

G.f. A(x) satisfies: ∑_n>=0 ( 1/A(x) - 1/(1+x)^3·n )ⁿ = 1. A317802

Catafusenes (see reference for precise definition). A45907

a(n) = (n!/2)*∑_k=1..n (n+k)!/(k!)³. A73014

Numbers n such that φ(φ(n)) + σ(σ(n)) - φ(σ(n)) - σ(φ(n)) = φ(n) + σ(n). A66939