Properties of the Number 64666

Sixty-Four Thousand Six Hundred Sixty-Six

Basics

Value: 64665 → 64666 → 64667

Parity: even

Prime: No

Previous Prime: 64663

Next Prime: 64667

Digit Sum: 28

Digital Root: 1

Palindrome: No

Factorization: 2 × 7 × 31 × 149

Divisors: 1, 2, 7, 14, 31, 62, 149, 217, 298, 434

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 1111110010011010

Octal: 176232

Duodecimal: 3150A

Hexadecimal: fc9a

Square: 4181691556

Square Root: 254.2951041605009

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

4-almost primes with semiprime digits (digits 4, 6, 9 only). A111496

Numbers k such that σ(k) = σ(k-1). A231546

Sum of squares of first n positive integers congruent to 1 mod 3. A24215

Decimal concatenations of the 38 quintuples (d1,d2,d3,d4,d5) with elements in {2,4,6} for which there exists a prime p >= 7 such that the differences between the 6 consecutive primes starting with p are (d1,d2,d3,d4,d5). A78870

Table of consecutive numbers with the same sum of divisors. A225757

Runs of consecutive numbers with the same number and sum of divisors. A225758

Numbers having four 6's in base 10. A43516

Lenny Conundrum #168: Neopet species in alphabetical order, converted to digits by the phone keypad code. A119568

Numbers k that divide σ(k) - σ(k-1). A227307

Number of 3 X n 0..3 arrays with no element equal to zero plus the sum of elements to its left or one plus the sum of the elements above it or two plus the sum of the elements diagonally to its northwest, modulo 4. A240395