Properties of the Number 26661

Twenty-Six Thousand Six Hundred Sixty-One

Basics

Value: 26660 → 26661 → 26662

Parity: odd

Prime: No

Previous Prime: 26647

Next Prime: 26669

Digit Sum: 21

Digital Root: 3

Palindrome: No

Factorization: 3 × 8887

Divisors: 1, 3, 8887, 26661

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 110100000100101

Octal: 64045

Duodecimal: 13519

Hexadecimal: 6825

Square: 710808921

Square Root: 163.28196471135445

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

Least k such that the k-th maximal antirun of squarefree numbers has length n. Position of first appearance of n in A373127. A373128

Number of partitions p of n such that (number of numbers of the form 5k + 2 in p) is a part of p. A241551

Numbers k such that the k-th maximal antirun of squarefree numbers has length different from all prior maximal antiruns. Sorted positions of first appearances in A373127. A373200

Number of ways writing 2ⁿ as a sum of two nonprime numbers. A62306

Expansion of 1/((1-4·x)*(1-7·x)*(1-8·x)). A19512

Expansion of g.f.: (1-4·z-sqrt(1-8·z+12·z²+8·z³-4·z⁴))/(2·z²(1-z)). A256939

G.f. A(x) satisfies [x^2·n] A(x)^5·n = 5 and [x^2·n+1] A(x)^5·n+2 = [x^2·n+1] A(x)^5·n+3 for n >= 1. A377097

T(2n,n-1), T given by A026659. A26661