Properties of the Number -665856

Six Hundred Sixty-Five Thousand Eight Hundred Fifty-Six

Basics

Value: -665857 → -665856 → -665855

Parity: even

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 36

Digital Root: 9

Palindrome: No

Factorization: 2 ⁸ × 3 ² × 17 ²

Divisors: 1, 2, 3, 4, 6, 8, 9, 12, 16, 17

Polygonal

Triangular: No

Square: Yes

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: -10100010100100000000

Octal: -2424400

Duodecimal: -281400

Hexadecimal: -a2900

Square: 443364212736

Square Root: 816

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

Squares of tetrahedral numbers: a(n) = binomial(n+3,n)². A1249

a(2n) = A002315(n), a(2n+1) = A082639(n+1). A113224

Expansion of (x⁴+x³-x²+x)/(x³+x²-3·x+1). A265278

Squares which are the product of a non-palindrome and its reversal, where leading zeros are not allowed. A76750

Number of dominating subsets with k vertices in all the graphs G(n) (n>=1) obtained by taking n copies of the path P₃ and identifying one of their endpoints (a star with n branches of length 2). A213667

Numbers k such that 2·k*(k+2) is a square. A82639

Squares whose decimal representation contains no proper subsequence which is a positive square. A130448

Squares whose decimal digits are nonsquares (2, 3, 5, 6, 7, 8). A77437

Squares that do not contain a shorter substring that is a square. A238334

Expansion of 2·x² / (x³ + x² - 3x + 1). A293004