Properties of the Number 65

Sixty-Five

Basics

Value: 64 → 65 → 66

Parity: odd

Prime: No

Previous Prime: 61

Next Prime: 67

Digit Sum: 11

Digital Root: 2

Palindrome: No

Factorization: 5 × 13

Divisors: 1, 5, 13, 65

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

8509 Try Today's Challenge

Representations

Binary: 1000001

Octal: 101

Duodecimal: 55

Hexadecimal: 41

Square: 4225

Square Root: 8.06225774829855

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: Yes

OEIS Sequences

The positive integers. Also called the natural numbers, the whole numbers or the counting numbers, but these terms are ambiguous. A27

Squarefree numbers: numbers that are not divisible by a square greater than 1. A5117

Semiprimes (or biprimes): products of two primes. A1358

The odd numbers: a(n) = 2·n + 1. A5408

Largest squarefree number dividing n: the squarefree kernel of n, rad(n), radical of n. A7947

The composite numbers: numbers n of the form x·y for x > 1 and y > 1. A2808

Completely multiplicative with a(prime(k)) = prime(k+1). A3961

The nonnegative integers. A1477

a(n) = 2ⁿ + 1. A51

Remove all factors of 2 from n; or largest odd divisor of n; or odd part of n. A265

We use cookies

Some cookies are essential for Natory to function, like keeping you signed in. We also use optional cookies to understand how the app is used and improve it over time. Learn more in our Privacy Policy. You can manage your preferences anytime.