Properties of the Number 66521

Sixty-Six Thousand Five Hundred Twenty-One

Basics

Value: 66520 → 66521 → 66522

Parity: odd

Prime: No

Previous Prime: 66509

Next Prime: 66523

Digit Sum: 20

Digital Root: 2

Palindrome: No

Factorization: 7 × 13 × 17 × 43

Divisors: 1, 7, 13, 17, 43, 91, 119, 221, 301, 559

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 10000001111011001

Octal: 201731

Duodecimal: 325B5

Hexadecimal: 103d9

Square: 4425043441

Square Root: 257.91665320409226

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

-7-Knödel numbers. A225511

a(n)=number of Catalan knight paths in right half-plane from (0,0) to (n,1). A96610

Numbers whose base-3 representation has exactly 11 runs. A43591

Number of walks within N³ (the first octant of Z³) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, -1), (-1, 0, 1), (1, -1, 1), (1, 1, 0), (1, 1, 1)}. A150933

Primes p(k) such that the product of digits of p(k) equals the product of digits of k. A66521