Properties of the Number 16665

Sixteen Thousand Six Hundred Sixty-Five

Basics

Value: 16664 → 16665 → 16666

Parity: odd

Prime: No

Previous Prime: 16661

Next Prime: 16673

Digit Sum: 24

Digital Root: 6

Palindrome: No

Factorization: 3 × 5 × 11 × 101

Divisors: 1, 3, 5, 11, 15, 33, 55, 101, 165, 303

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2730 Try Today's Challenge

Representations

Binary: 100000100011001

Octal: 40431

Duodecimal: 9789

Hexadecimal: 4119

Square: 277722225

Square Root: 129.0929897399545

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

a(n) = a(n-1) + a(n-5); a(0) = ... = a(4) = 1. A3520

Denominators of cosecant numbers: -2*(2^2·n-1-1)*Bernoulli(2·n). A1897

Number of partitions of n having (sum of odd parts) = (sum of even parts). A239261

Beastly (or hateful) numbers: numbers containing the string 666 in their decimal expansion. A51003

Expansion of 1/(1 -x⁵ -x⁶ -x⁷ - ...). A17899

Antidiagonal sums of the convolution array A213505. A213547

Number of partitions of 4n with equal sums of odd and even parts. A249914

Numbers with exactly 4 distinct palindromic prime factors. A46402

Pair the odd numbers such that the k-th pair is (r, r+2k) where r is the smallest odd number not included earlier: (1, 3), (5, 9), (7, 13), (11, 19), (15, 25), (17, 29), (21, 35), (23, 39), (27, 45), ... This is the sequence of the product of the members of pairs. A75320

Numbers n such that the decimal digits of n² are all prime. A275971