Properties of the Number 1666

One Thousand Six Hundred Sixty-Six

Basics

Value: 1665 → 1666 → 1667

Parity: even

Prime: No

Previous Prime: 1663

Next Prime: 1667

Digit Sum: 19

Digital Root: 1

Palindrome: No

Factorization: 2 × 7 ² × 17

Divisors: 1, 2, 7, 14, 17, 34, 49, 98, 119, 238

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 11010000010

Octal: 3202

Duodecimal: B6A

Hexadecimal: 682

Square: 2775556

Square Root: 40.8166632639171

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

Coordination sequence for "tsi" 3D uniform tiling. A299289

Generalized 13-gonal numbers: m*(11·m-9)/2 with m = 0, 1, -1, 2, -2, 3, -3, ... A195313

Integers of the form m*(m + 7)/8. A274979

Table a(d,m) of number of points of L1 norm m in cubic lattice Z^d, read by antidiagonals (d >= 1, m >= 0). A35607

Number of partitions of n into parts >= 5. A185325

Triangle T(n,k) of n X n binary matrices with k=0..n² ones under action of dihedral group of the square D₄. A54252

Number of numbers removed in each step of Eratosthenes's sieve for 10⁴. A145540

Number of partitions of n such that the set of parts and the set of multiplicities of parts are disjoint. A114639

Number of partitions of n in which the least part is 5. A26798

Numbers m such that there are precisely 10 groups of order m. A249553