Properties of the Number 66781

Sixty-Six Thousand Seven Hundred Eighty-One

Basics

Value: 66780 → 66781 → 66782

Parity: odd

Prime: No

Previous Prime: 66763

Next Prime: 66791

Digit Sum: 28

Digital Root: 1

Palindrome: No

Factorization: 11 × 13 × 467

Divisors: 1, 11, 13, 143, 467, 5137, 6071, 66781

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 10000010011011101

Octal: 202335

Duodecimal: 32791

Hexadecimal: 104dd

Square: 4459701961

Square Root: 258.42020044880394

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

Crystal ball sequence for the A2·A2 lattice. A143008

Integer k associated with the conjectured record-breaking length A226686(n) of primitive Collatz-like 3x-k cycles. A226687

Integer k associated with the conjectured record-breaking maximal element A226683(n) of primitive 3x-k cycles. A226684

Number of bicolored graphs on n unlabeled nodes such that black nodes are not adjacent to each other and every white node is adjacent to a black node. A340021

Integer k associated with the conjectured record-breaking maximal value A226681(n) of the minimal elements of primitive Collatz-like 3x-k cycles. A226682

Star numbers (A003154) whose digital sum and product of nonzero digits are both triangular numbers. A83748

a(n) = 2^φ(n). A66781

a(1)=4. For n>=2, a(n) = smallest integer > a(n-1) that is not coprime to (n+1) but is coprime to n. A139558