Properties of the Number 66491

Sixty-Six Thousand Four Hundred Ninety-One

Basics

Value: 66490 → 66491 → 66492

Parity: odd

Prime: Yes

Previous Prime: 66467

Next Prime: 66499

Digit Sum: 26

Digital Root: 8

Palindrome: No

Factorization: 66491

Divisors: 1, 66491

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 10000001110111011

Octal: 201673

Duodecimal: 3258B

Hexadecimal: 103bb

Square: 4421053081

Square Root: 257.8584883225681

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 A(n,k) of partitions of the (n+k)-multiset {0,...,0,1,2,...,k} with n 0's into distinct multisets; square array A(n,k), n>=0, k>=0, read by antidiagonals. A346520

a(n) = (1/2)*(Bell(n+2)+Bell(n+1)-Bell(n)). A87648

Table T(n,k) = sum over all set partitions of n of number at index k. A120057

Number of partitions of the (n+8)-multiset {0,...,0,1,2,...,8} with n 0's into distinct multisets. A346828

Number of partitions of the (n+9)-multiset {1,2,...,n,1,2,...,9} into distinct multisets. A346902

Smallest prime p > prime(n+2) such that the first n odd primes 3, 5, 7, 11, ..., prime(n+1) are quadratic residues mod p, and prime(n+2) is a quadratic non-residue mod p. A222756

Twin prime gaps: Pairs k, k+1 such that f(k) = f(k+1), where f is the prime gaps function given by f(m) = prime(m+1)-prime(m) and prime(m) denotes the m-th prime. A66491