Properties of the Number 16661

Sixteen Thousand Six Hundred Sixty-One

Basics

Value: 16660 → 16661 → 16662

Parity: odd

Prime: Yes

Previous Prime: 16657

Next Prime: 16673

Digit Sum: 20

Digital Root: 2

Palindrome: Yes

Factorization: 16661

Divisors: 1, 16661

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 100000100010101

Octal: 40425

Duodecimal: 9785

Hexadecimal: 4115

Square: 277588921

Square Root: 129.07749610214788

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

Palindromic primes: prime numbers whose decimal expansion is a palindrome. A2385

Primes whose base-4 representation also is the base 2-representation of a prime. A235461

Primes p = prime(i) of level (1,3), i.e., such that A118534(i) = prime(i-3). A118467

Beastly (or hateful) numbers: numbers containing the string 666 in their decimal expansion. A51003

Primes which can be expressed as sum of distinct powers of 4. A77718

Primes that contain digits 1 and 6 only. A20454

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

Primes p such that the multiplicative order of 2 modulo p is (p-1)/5. A1135

Smallest palindromic prime containing exactly n 6's. A83977

Centered 28-gonal numbers. A195314