686665233 has 12 divisors (see below), whose sum is σ = 992077008. Its totient is φ = 457671960.

The previous prime is 686665223. The next prime is 686665261. The reversal of 686665233 is 332566686.

686665233 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 686665233 - 2⁶ = 686665169 is a prime.

It is not an unprimeable number, because it can be changed into a prime (686665223) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 71698 + ... + 80708.

It is an arithmetic number, because the mean of its divisors is an integer number (82673084).

Almost surely, 2^686665233 is an apocalyptic number.

It is an amenable number.

686665233 is a deficient number, since it is larger than the sum of its proper divisors (305411775).

686665233 is a wasteful number, since it uses less digits than its factorization.

686665233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17484 (or 17481 counting only the distinct ones).

The product of its digits is 933120, while the sum is 45.

The square root of 686665233 is about 26204.2979871623. The cubic root of 686665233 is about 882.2297248185.

The spelling of 686665233 in words is "six hundred eighty-six million, six hundred sixty-five thousand, two hundred thirty-three".