Properties of the Number 66221

Sixty-Six Thousand Two Hundred Twenty-One

Basics

Value: 66220 → 66221 → 66222

Parity: odd

Prime: Yes

Previous Prime: 66191

Next Prime: 66239

Digit Sum: 17

Digital Root: 8

Palindrome: No

Factorization: 66221

Divisors: 1, 66221

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 10000001010101101

Octal: 201255

Duodecimal: 323A5

Hexadecimal: 102ad

Square: 4385220841

Square Root: 257.33441277839233

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

Numbers that are the sum of 12 positive 10th powers. A4812

Number A(n,k) of hybrid k-ary trees with n internal nodes; square array A(n,k), n>=0, k>=1, read by antidiagonals. A245049

Number of hybrid 5-ary trees with n internal nodes. A239108

Primes having only {1, 2, 6} as digits. A385774

Let D(k) = {d(k,i)}, i = 1,2,...,q be the set of q divisors of an integer k. a(n) is the smallest number k such that there exist exactly n distinct integers M, 1 < M < k, where each set D(k) mod M is a multiplicative group. A379645

Sum{T(n-k,k)}, 0<=k<=[ n/2 ], T given by A026648. A26658

Bisection of A001189. A66221