Properties of the Number 66921

Sixty-Six Thousand Nine Hundred Twenty-One

Basics

Value: 66920 → 66921 → 66922

Parity: odd

Prime: No

Previous Prime: 66919

Next Prime: 66923

Digit Sum: 24

Digital Root: 6

Palindrome: No

Factorization: 3 × 22307

Divisors: 1, 3, 22307, 66921

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 10000010101101001

Octal: 202551

Duodecimal: 32889

Hexadecimal: 10569

Square: 4478420241

Square Root: 258.6909352876517

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

a(n) = 9800·n²-5740·n-4059. A118061

The index of the first of two consecutive positive triangular numbers (A000217) the sum of which is equal to the sum of four consecutive positive triangular numbers. A262490

a(n) is the lower end of a record gap A349995(n) between consecutive odd squarefree semiprimes (A046388). A350098

Start of record gap in odd semiprimes A046315. A114057

a(n) = 2·A000129(n) - 1. A133654

a(n)=a(n-1)+3a(n-2)+a(n-3). A137199

a(n) = lcm(ω(n), ω(n)). A66921