Properties of the Number 66625

Sixty-Six Thousand Six Hundred Twenty-Five

Basics

Value: 66624 → 66625 → 66626

Parity: odd

Prime: No

Previous Prime: 66617

Next Prime: 66629

Digit Sum: 25

Digital Root: 7

Palindrome: No

Factorization: 5 ³ × 13 × 41

Divisors: 1, 5, 13, 25, 41, 65, 125, 205, 325, 533

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 10000010001000001

Octal: 202101

Duodecimal: 32681

Hexadecimal: 10441

Square: 4438890625

Square Root: 258.11818998280614

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 n that are the hypotenuse of exactly 31 distinct integer-sided right triangles, i.e., n² can be written as a sum of two squares in 31 ways. A97244

Numbers that are the sum of 2 nonzero squares in 7 or more ways. A25298

Numbers that are the sum of 2 nonzero squares in 8 or more ways. A25299

Numbers that are the sum of 2 distinct nonzero squares in 7 or more ways. A25317

Numbers that are the sum of 2 distinct nonzero squares in 8 or more ways. A25318

Numbers that are the sum of 2 nonzero squares in exactly 8 ways. A25291

Numbers that are the sum of 2 distinct nonzero squares in exactly 8 ways. A25309

a(n) = ∏_k=1..n (2·k*(k-1)+1). A277347

Number of nX6 0..1 arrays with every element equal to 0, 2, 3 or 5 king-move adjacent elements, with upper left element zero. A297941

Number of nonempty subsets of {1,2,...,n} in which exactly 1/5 of the elements are <= (n-2)/2. A47187