Properties of the Number 66671

Sixty-Six Thousand Six Hundred Seventy-One

Basics

Value: 66670 → 66671 → 66672

Parity: odd

Prime: No

Previous Prime: 66653

Next Prime: 66683

Digit Sum: 26

Digital Root: 8

Palindrome: No

Factorization: 11 ² × 19 × 29

Divisors: 1, 11, 19, 29, 121, 209, 319, 551, 2299, 3509

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 10000010001101111

Octal: 202157

Duodecimal: 326BB

Hexadecimal: 1046f

Square: 4445022241

Square Root: 258.20728107472104

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

Number of subsets of {1..n} without a subset summing to n. A365377

a(n) is the smallest nonnegative integer k where exactly n solutions to x² + 3·x*y + y² = k with 0 < x < y. A374095

Numbers k such that k - A224787(k) is a square. A386623

a(n) = numerator(-1/n + ∑_k=1..n 2^k-1/k). A332786

Smallest k such that k can be written in exactly n ways as x² + 3·x*y + y² with 0 <= x <= y. A374275

a(n) = (n + 1)*(2·n + 1)*(4·n + 9)/3. A269342

Sum over divisors d of n of Kronecker symbol (5∣d). A35187

a(n) is the largest power of 2 that divides φ(A066669(n)). A66671

a(n) is the smallest nonnegative integer k where exactly n ordered pairs of positive integers (x, y) exist such that x² + 3·x*y + y² = k. A374091