668975863 has 4 divisors (see below), whose sum is σ = 683209440. Its totient is φ = 654742288.

The previous prime is 668975843. The next prime is 668975899. The reversal of 668975863 is 368579866.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 668975863 - 2¹³ = 668967671 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 668975798 and 668975807.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668975843) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7116718 + ... + 7116811.

It is an arithmetic number, because the mean of its divisors is an integer number (170802360).

Almost surely, 2^668975863 is an apocalyptic number.

668975863 is a deficient number, since it is larger than the sum of its proper divisors (14233577).

668975863 is a wasteful number, since it uses less digits than its factorization.

668975863 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14233576.

The product of its digits is 13063680, while the sum is 58.

The square root of 668975863 is about 25864.5677133796. The cubic root of 668975863 is about 874.5879368077.

The spelling of 668975863 in words is "six hundred sixty-eight million, nine hundred seventy-five thousand, eight hundred sixty-three".