Properties of the Number 16680

Sixteen Thousand Six Hundred Eighty

Basics

Value: 16679 → 16680 → 16681

Parity: even

Prime: No

Previous Prime: 16673

Next Prime: 16691

Digit Sum: 21

Digital Root: 3

Palindrome: No

Factorization: 2 ³ × 3 × 5 × 139

Divisors: 1, 2, 3, 4, 5, 6, 8, 10, 12, 15

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 100000100101000

Octal: 40450

Duodecimal: 97A0

Hexadecimal: 4128

Square: 278222400

Square Root: 129.15107432770353

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

Numbers k such that 2^k - 3 is prime. A50414

T(n,k) = Number of squarefree words of length n in a (k+1)-ary alphabet. A214943

Cluster series for honeycomb. A3204

a(n) equals sum of first n terms of A(x)ⁿ for n>=1, with a(0)=1. A88358

Triangle, read by rows, where e.g.f. A(x,y) satisfies: A(x,y) = exp(x·y*A(x,y+1)) and A(x,y) = ∑_n>=0 ∑_k>=0 T(n,k)/n!*xⁿ*y^k. A96542

Coefficients in the expansion of ∏_m>=1 (1 - q^13·m)/(1 - q^m). A341714

Expansion of e.g.f. log( 1 + x³ * exp(x) / 3! ). A346751

Numbers k such that σ(k² + 1) == 0 (mod k). A67719

Expansion of ∏_k>=1 ((1-x^5·k)/(1-x^k))^k. A285263

Numbers whose binary indices are all semiprimes. A371454