Properties of the Number 25664

Twenty-Five Thousand Six Hundred Sixty-Four

Basics

Value: 25663 → 25664 → 25665

Parity: even

Prime: No

Previous Prime: 25657

Next Prime: 25667

Digit Sum: 23

Digital Root: 5

Palindrome: No

Factorization: 2 ⁶ × 401

Divisors: 1, 2, 4, 8, 16, 32, 64, 401, 802, 1604

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 110010001000000

Octal: 62100

Duodecimal: 12A28

Hexadecimal: 6440

Square: 658640896

Square Root: 160.1998751560063

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 of Legendre-Stirling numbers of the second kind T(n,j), n >= 1, 1 <= j <= n, read by rows. A71951

T(n,k)=4-level binary fanout graph coloring a rectangular array: number of nXk 0..14 arrays where 0..14 label nodes of a graph with edges 0,1 1,3 3,5 3,6 1,4 4,7 4,8 0,2 2,9 9,11 9,12 2,10 10,13 10,14 and every array movement to a horizontal or vertical neighbor moves along an edge of this graph. A223449

Diagonal T(n, 4) of triangle in A071951. A71952

a(n) = 25·n² + 2·n. A154377

a(n) = ∑_{k=0..floor(n/3)} 2^n-2·k * binomial(k,n-3·k)². A387485

Least k such that the first k terms of A006928 contain n more 2's than 1's. A25507

Number of 2 X 2 matrices having all terms in {1,...,n} and nonnegative determinant. A211058

Indices in A006928 where the imbalance between 1's and 2's sets a new record. A274775

Number of triangular regions in a "frame" of size n X n (see Comments in A331776 for definition), divided by 4. A332595

a(n) = 16·a(n-1) - 56·a(n-2) for n>1, with a(0)=1, a(1)=16. A154348