Properties of the Number 66644

Sixty-Six Thousand Six Hundred Forty-Four

Basics

Value: 66643 → 66644 → 66645

Parity: even

Prime: No

Previous Prime: 66643

Next Prime: 66653

Digit Sum: 26

Digital Root: 8

Palindrome: No

Factorization: 2 ² × 16661

Divisors: 1, 2, 4, 16661, 33322, 66644

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 10000010001010100

Octal: 202124

Duodecimal: 32698

Hexadecimal: 10454

Square: 4441422736

Square Root: 258.15499220429575

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

Number of alternating compositions, i.e., compositions with alternating increases and decreases, starting with either an increase or a decrease. A25047

Number of alternating compositions of n, including twins (x,x). A344604

n and π(n) are both made of nontrivial runs of identical digits, where π(n)=A000720(n). A116056

Numbers k whose decimal representation ends with that of π(k) (where π denotes the prime counting function A000720). A306572

Numbers k such that the value π(k), the number of primes <= k, can be obtained deleting some of the repeating adjacent digits of k. A113898

Number of integer partitions of the n-th semiprime into semiprimes. A338902

a(n) = floor(surface area of a sphere with radius n). A66644