Properties of the Number 668

Six Hundred Sixty-Eight

Basics

Value: 667 → 668 → 669

Parity: even

Prime: No

Previous Prime: 661

Next Prime: 673

Digit Sum: 20

Digital Root: 2

Palindrome: No

Factorization: 2 ² × 167

Divisors: 1, 2, 4, 167, 334, 668

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2730 Try Today's Challenge

Representations

Binary: 1010011100

Octal: 1234

Duodecimal: 478

Hexadecimal: 29c

Square: 446224

Square Root: 25.84569596664017

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

Expansion of ∏_{m >= 1} (1 + x^m); number of partitions of n into distinct parts; number of partitions of n into odd parts. A9

Number of subsets {x(1),x(2),...,x(k)} of {1,2,...,n} such that all differences |x(i)-x(j)| are distinct. A143823

Numbers whose ternary expansion contains no 1's. A5823

Number of partitions of n into parts of the form 4·k + 2. A35457

G.f.: ∏_{n >= 0} (1+x²ⁿ⁺¹)/(1-x²ⁿ⁺¹). A80054

Numbers m such that the Bernoulli number B_2·m has denominator 30. A51225

Number of set partitions of [n] into blocks with distinct element sums. A275780

Expansion of ∑_k>=2 x^k*(k+3/2) / ∏_j=1..k (1 - x^j). A318029

Numbers m such that the Bernoulli number B_m has denominator 30. A51226

Numbers whose sum of digits is 20. A235229