Properties of the Number 80661

Eighty Thousand Six Hundred Sixty-One

Basics

Value: 80660 → 80661 → 80662

Parity: odd

Prime: No

Previous Prime: 80657

Next Prime: 80669

Digit Sum: 21

Digital Root: 3

Palindrome: No

Factorization: 3 × 7 × 23 × 167

Divisors: 1, 3, 7, 21, 23, 69, 161, 167, 483, 501

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 10011101100010101

Octal: 235425

Duodecimal: 3A819

Hexadecimal: 13b15

Square: 6506196921

Square Root: 284.0088026804803

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

Number T(n,k) of equivalence classes of ways of placing k 2 X 2 tiles in an n X 7 rectangle under all symmetry operations of the rectangle; irregular triangle T(n,k), n>=2, 0<=k<=3·floor(n/2), read by rows. A238555

Number T(n,k) of equivalence classes of ways of placing k 2 X 2 tiles in an n X 8 rectangle under all symmetry operations of the rectangle; irregular triangle T(n,k), n>=2, 0<=k<=4·floor(n/2), read by rows. A238557

Nonnegative values·of solutions (x, y) to the Diophantine equation x²+(x+287)² = y². A205644

Least nonsquare whose square root starts with just n even decimal digits. A210492

Least nonsquare whose square root starts with at least n even decimal digits. A220426

Sum of 1-fibits in Zeckendorf-expansion A014417(p) summed for all primes p in range ]2ⁿ,2ⁿ⁺¹]. A95336

Order of group of n X n X n Rubik cube, under assumptions s, not-m, not-i. A80661