Properties of the Number 66581

Sixty-Six Thousand Five Hundred Eighty-One

Basics

Value: 66580 → 66581 → 66582

Parity: odd

Prime: No

Previous Prime: 66571

Next Prime: 66587

Digit Sum: 26

Digital Root: 8

Palindrome: No

Factorization: 139 × 479

Divisors: 1, 139, 479, 66581

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 10000010000010101

Octal: 202025

Duodecimal: 32645

Hexadecimal: 10415

Square: 4433029561

Square Root: 258.0329436331725

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

Decimal representation of the x-axis, from the left edge to the origin, of the n-th stage of growth of the two-dimensional cellular automaton defined by "Rule 51", based on the 5-celled von Neumann neighborhood. A278594

E.g.f. A(x) satisfies A(x) = exp( -x/A(x) * exp(x/A(x)) ). A380427

Main diagonal of triangle A132784. A132785

Number of (n+3)X(n+3) binary arrays with every 4X4 subblock commuting with each horizontal and vertical neighbor 4X4 subblock. A188096

Product of nonzero digits of A066547(n). A66581