Properties of the Number 66121

Sixty-Six Thousand One Hundred Twenty-One

Basics

Value: 66120 → 66121 → 66122

Parity: odd

Prime: No

Previous Prime: 66109

Next Prime: 66137

Digit Sum: 16

Digital Root: 7

Palindrome: No

Factorization: 11 × 6011

Divisors: 1, 11, 6011, 66121

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 10000001001001001

Octal: 201111

Duodecimal: 32321

Hexadecimal: 10249

Square: 4371986641

Square Root: 257.14003966710436

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

Expansion of e.g.f. cos(x/cos(x)) (even powers only). A9118

1/9 the number of (n+1) X 6 0..2 arrays with all 2 X 2 subblocks having the same four values. A184044

E.g.f. exp(x/cosh(x)). A9301

T(n,k) = 1/9 the number of (n+1) X (k+1) 0..2 arrays with all 2 X 2 subblocks having the same four values. A184048

Multi-level factorials: triangle with a(n,k)=a(n-1,k-1)*a(n-1,k) but with a(n,1)=n and a(n,n)=1. A66121