Properties of the Number 66815

Sixty-Six Thousand Eight Hundred Fifteen

Basics

Value: 66814 → 66815 → 66816

Parity: odd

Prime: No

Previous Prime: 66809

Next Prime: 66821

Digit Sum: 26

Digital Root: 8

Palindrome: No

Factorization: 5 × 7 × 23 × 83

Divisors: 1, 5, 7, 23, 35, 83, 115, 161, 415, 581

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 10000010011111111

Octal: 202377

Duodecimal: 327BB

Hexadecimal: 104ff

Square: 4464244225

Square Root: 258.48597640877927

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

RMS numbers: numbers n such that root mean square of divisors of n is an integer. A140480

Numbers whose sum of the squares of divisors is also a square number. A46655

Numbers m such that the arithmetic mean and the quadratic mean (the root mean square) of the divisors of m are both integers. A327055

Numbers k such that k and k+1 are both terms in A377209. A377271

Denominators of continued fraction convergents to sqrt(695). A42337

Numbers k such that the sum of unitary divisors of k² is a square. A64498

Composite RMS numbers: composite numbers c such that root mean square of divisors of c is an integer. A158287

a(n) is the product of n, the n-th prime and the n-th composite number. A331999

Tetraprimes (or products of exactly four distinct prime numbers) that are the sum of two successive tetraprimes. A380348

Number of partitions of n into sums of products. A66815