Properties of the Number 66666

Sixty-Six Thousand Six Hundred Sixty-Six

Basics

Value: 66665 → 66666 → 66667

Parity: even

Prime: No

Previous Prime: 66653

Next Prime: 66683

Digit Sum: 30

Digital Root: 3

Palindrome: Yes

Factorization: 2 × 3 × 41 × 271

Divisors: 1, 2, 3, 6, 41, 82, 123, 246, 271, 542

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 10000010001101010

Octal: 202152

Duodecimal: 326B6

Hexadecimal: 1046a

Square: 4444355556

Square Root: 258.1975987494849

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

Repdigit numbers, or numbers whose digits are all equal. A10785

Numbers k such that the k-th triangular number contains only digits {0,1,2}. A119034

a(n) = 6*(10ⁿ - 1)/9. A2280

Numbers whose set of base-10 digits is {0,6}. A204093

Numbers which have only digits 6 and 7 in base 10. A256292

a(n) = floor(10⁶/n). A33426

Numbers > 9 with all digits the same. A14181

Number of Fibonacci numbers F(k), k <= 10ⁿ, which end in 2. A73548

Numbers which can be expressed as the product of numbers made of only sixs. A161144

Fourth powers (n·n * n·n) in carryless arithmetic mod 10. A169886