Properties of the Number 66687

Sixty-Six Thousand Six Hundred Eighty-Seven

Basics

Value: 66686 → 66687 → 66688

Parity: odd

Prime: No

Previous Prime: 66683

Next Prime: 66697

Digit Sum: 33

Digital Root: 6

Palindrome: No

Factorization: 3 × 22229

Divisors: 1, 3, 22229, 66687

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

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Representations

Binary: 10000010001111111

Octal: 202177

Duodecimal: 32713

Hexadecimal: 1047f

Square: 4447155969

Square Root: 258.2382620759364

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

Place n equally spaced points on each side of an equilateral triangle, and join each of these points by a chord to the 2·n new points on the other two sides: sequence gives number of edges in the resulting planar graph. A366485

Integer part of log(n!)^{1 + log(n}). A62473

Table read by antidiagonals: Place k equally spaced points on each side of a regular n-gon and join every pair of these n·k points by a chord; T(n,k) (n >= 3, k >= 0) gives the number of edges in the resulting planar graph. A367305

Numbers n such that prime(n) == n (mod φ(n)). A66687