Properties of the Number 66891

Sixty-Six Thousand Eight Hundred Ninety-One

Basics

Value: 66890 → 66891 → 66892

Parity: odd

Prime: No

Previous Prime: 66889

Next Prime: 66919

Digit Sum: 30

Digital Root: 3

Palindrome: No

Factorization: 3 × 11 × 2027

Divisors: 1, 3, 11, 33, 2027, 6081, 22297, 66891

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

8109 Try Today's Challenge

Representations

Binary: 10000010101001011

Octal: 202513

Duodecimal: 32863

Hexadecimal: 1054b

Square: 4474405881

Square Root: 258.6329445372341

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

Triangle read by rows: T(n,k) is the number of weighted lattice paths in B(n) having k returns to the horizontal axis (i.e., (1,-1)-steps ending on the horizontal axis). The members of B(n) are paths of weight n that start in (0,0), end on but never go below the horizontal axis, and whose steps are of the following four kinds: a (1,0)-step with weight 1; a (1,0)-step with weight 2; a (1,1)-step with weight 2; a (1,-1)-step with weight 1. The weight of a path is the sum of the weights of its steps. A246179

Max (k : prime(k+n)-prime(k) = 0 mod(k)). A66891