Properties of the Number 66841

Sixty-Six Thousand Eight Hundred Forty-One

Basics

Value: 66840 → 66841 → 66842

Parity: odd

Prime: Yes

Previous Prime: 66821

Next Prime: 66851

Digit Sum: 25

Digital Root: 7

Palindrome: No

Factorization: 66841

Divisors: 1, 66841

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 10000010100011001

Octal: 202431

Duodecimal: 32821

Hexadecimal: 10519

Square: 4467719281

Square Root: 258.5362643808408

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

Total number of congruence subgroups of PSL(2,Z) of genus n. A258691

Square array A(n,k), n >= 0, k >= 1, read by antidiagonals, where column k is the expansion of e.g.f. exp(∑_j=1..k j²*x^j). A293724

Largest prime substring in 6ⁿ (0 if none). A46272

First primes of record chains of consecutive primes such that all of them are evil (A027699). A177748

E.g.f.: exp(x + 4·x² + 9·x³). A293721

a(n) = Product{k∣n} k^n/k; product is over the positive divisors of n. A66841

Number of n X 3 0,1 arrays indicating 2 X 2 subblocks of some larger (n+1) X 4 binary array having determinant equal to one, with rows and columns of the latter in nondecreasing lexicographic order. A227638