Properties of the Number 166

One Hundred Sixty-Six

Basics

Value: 165 → 166 → 167

Parity: even

Prime: No

Previous Prime: 163

Next Prime: 167

Digit Sum: 13

Digital Root: 4

Palindrome: No

Factorization: 2 × 83

Divisors: 1, 2, 83, 166

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 10100110

Octal: 246

Duodecimal: 11A

Hexadecimal: a6

Square: 27556

Square Root: 12.884098726725126

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

Semiprimes (or biprimes): products of two primes. A1358

Numbers k such that (8·10^k + 49)/3 is prime. A270890

Squarefree semiprimes: Numbers that are the product of two distinct primes. A6881

a(n) = prime(n) - 1. A6093

a(n) = 3·n + 1. A16777

Positive integers congruent to 2 (mod 4): a(n) = 4·n+2, for n >= 0. A16825

The Collatz or 3x+1 map: a(n) = n/2 if n is even, 3n + 1 if n is odd. A6370

The primes doubled; even semiprimes. A100484

Values taken by totient function φ(m) (A000010). A2202

Centered triangular numbers: a(n) = 3·n*(n-1)/2 + 1. A5448

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