649766668 has 12 divisors (see below), whose sum is σ = 1137887632. Its totient is φ = 324655920.

The previous prime is 649766659. The next prime is 649766687. The reversal of 649766668 is 866667946.

649766668 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 50343 + ... + 61918.

Almost surely, 2^649766668 is an apocalyptic number.

It is an amenable number.

649766668 is a deficient number, since it is larger than the sum of its proper divisors (488120964).

649766668 is a wasteful number, since it uses less digits than its factorization.

649766668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113712 (or 113710 counting only the distinct ones).

The product of its digits is 15676416, while the sum is 58.

The square root of 649766668 is about 25490.5211402199. The cubic root of 649766668 is about 866.1354409855.

The spelling of 649766668 in words is "six hundred forty-nine million, seven hundred sixty-six thousand, six hundred sixty-eight".