Properties of the Number 66991

Sixty-Six Thousand Nine Hundred Ninety-One

Basics

Value: 66990 → 66991 → 66992

Parity: odd

Prime: No

Previous Prime: 66977

Next Prime: 67003

Digit Sum: 31

Digital Root: 4

Palindrome: No

Factorization: 31 × 2161

Divisors: 1, 31, 2161, 66991

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 10000010110101111

Octal: 202657

Duodecimal: 32927

Hexadecimal: 105af

Square: 4487794081

Square Root: 258.82619651032235

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

p-INVERT of (1,0,0,0,0,1,0,0,0,0,0,0,...), where p(S) = 1 - S². A292403

Products of 6 distinct primes that are sandwiched between semiprime numbers. A378627

Square array read by descending antidiagonals of number of ways of dividing n·k labeled items into k unlabeled orders with n items in each order. A66991