Properties of the Number 66440

Sixty-Six Thousand Four Hundred Forty

Basics

Value: 66439 → 66440 → 66441

Parity: even

Prime: No

Previous Prime: 66431

Next Prime: 66449

Digit Sum: 20

Digital Root: 2

Palindrome: No

Factorization: 2 ³ × 5 × 11 × 151

Divisors: 1, 2, 4, 5, 8, 10, 11, 20, 22, 40

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 10000001110001000

Octal: 201610

Duodecimal: 32548

Hexadecimal: 10388

Square: 4414273600

Square Root: 257.75957790157867

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

Array t(n, k) = (k*(n-1) +2-k)*t(n-1, k) + k·t(n-2, k), with t(1, k) = 1, t(2, k) = 2, read by antidiagonals. A144446

Number of transitions necessary for a Turing machine to compute the differences between consecutive primes (primes written in unary), when using the instruction table below. A78612

Numbers whose distance to the nearest cube equals the distance to the nearest product of 3 consecutive integers (three-dimensional oblong). A342873

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

Numbers n such that number of runs in the base 3 representation of n is congruent to 1 mod 10. A43816

Numbers k such that both the sum of the semiprime divisors of k and the sum of the prime divisors of k are squares. A227478

a(n) = 9ⁿ mod n. A66440

a(n) is the number of edges of a regular polygon P with the property that packing n nonoverlapping equal circles inside P, arranged in a configuration with dihedral symmetry D_2m with m >= 3, maximizes the packing density. A343262