Properties of the Number 66381

Sixty-Six Thousand Three Hundred Eighty-One

Basics

Value: 66380 → 66381 → 66382

Parity: odd

Prime: No

Previous Prime: 66377

Next Prime: 66383

Digit Sum: 24

Digital Root: 6

Palindrome: No

Factorization: 3 × 7 × 29 × 109

Divisors: 1, 3, 7, 21, 29, 87, 109, 203, 327, 609

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

4823 Try Today's Challenge

Representations

Binary: 10000001101001101

Octal: 201515

Duodecimal: 324B9

Hexadecimal: 1034d

Square: 4406437161

Square Root: 257.64510474682027

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

The sum of the next n terms of A114103. A114105

On a spirally numbered square grid, with labels starting at 1, this is the number of steps that an (n,n+1) leaper makes before getting trapped, or -1 if it never gets trapped. A343178

Numbers k such that there are 10 digits in k² and for each factor f of 10 (1, 2, 5) the sum of digit groupings of size f is a square. A153748

a(n) = ∑_k=0..n binomial(4·n,k). A66381

a(n) is the smallest number k for which the smallest part of the symmetric representation of σ of k, SRS(k), has size n. If no such number exists, a(n) = -1. A386608