Properties of the Number 66643

Sixty-Six Thousand Six Hundred Forty-Three

Basics

Value: 66642 → 66643 → 66644

Parity: odd

Prime: Yes

Previous Prime: 66629

Next Prime: 66653

Digit Sum: 25

Digital Root: 7

Palindrome: No

Factorization: 66643

Divisors: 1, 66643

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

8509 Try Today's Challenge

Representations

Binary: 10000010001010011

Octal: 202123

Duodecimal: 32697

Hexadecimal: 10453

Square: 4441289449

Square Root: 258.1530553760695

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

Beastly primes (version 2): primes containing 666 as a substring. A131645

Primes having only {3, 4, 6} as digits. A199346

Numbers n such that n, 10·n+1, 10·n+3, 10·n+7 and 10·n+9 are all primes. A67267

Last prime in n-th group in A077280. A77283

Coefficients of the sixth-order mock θ function phi_-(q). A153251

The number of order-decreasing partial isometries (of an n-chain). A184052

a(n) = floor(π*n²). A66643

Beastly primes (version 1): either 666 followed by 0's and a 1 or 7 at the right end or a palindrome with 666 in the center, 0's surrounding these digits, and 1 or 7 at both ends. A186086

Sum of next a(n) successive primes is a square. A77280

Square root of sum of successive primes in n-th group in A077280. A77281