Properties of the Number 663

Six Hundred Sixty-Three

Basics

Value: 662 → 663 → 664

Parity: odd

Prime: No

Previous Prime: 661

Next Prime: 673

Digit Sum: 15

Digital Root: 6

Palindrome: No

Factorization: 3 × 13 × 17

Divisors: 1, 3, 13, 17, 39, 51, 221, 663

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 1010010111

Octal: 1227

Duodecimal: 473

Hexadecimal: 297

Square: 439569

Square Root: 25.748786379167466

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 formed from even-numbered columns of triangle of expansions of powers of·in terms of Chebyshev polynomials U_n(x). A39599

Number of partitions of n whose mean is a part. A237984

Smith (or joke) numbers: composite numbers k such that sum of digits of k = sum of digits of prime factors of k (counted with multiplicity). A6753

Triangle T(n,k) read by rows, giving number of graphs with n nodes (n >= 1) and k edges (0 <= k <= n(n-1)/2). A8406

Coefficients of the '3rd-order' mock θ function ψ(q). A53251

a(n) = n*(4·n-1). A33991

a(n) = n*(n+5)/2. A55998

Number of integer partitions of n of which every permutation has a consecutive monotone triple, i.e., a triple (..., x, y, z, ...) such that either x <= y <= z or x >= y >= z. A344654

Number of integer partitions of n without an alternating permutation. A345165

Even triangular numbers halved. A74378