664106672 has 20 divisors (see below), whose sum is σ = 1287141576. Its totient is φ = 331941120.

The previous prime is 664106659. The next prime is 664106693. The reversal of 664106672 is 276601466.

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, 62963 + ... + 72749.

Almost surely, 2^664106672 is an apocalyptic number.

It is an amenable number.

664106672 is a deficient number, since it is larger than the sum of its proper divisors (623034904).

664106672 is a wasteful number, since it uses less digits than its factorization.

664106672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14036 (or 14030 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 38.

The square root of 664106672 is about 25770.2672085487. The cubic root of 664106672 is about 872.4608497415.

The spelling of 664106672 in words is "six hundred sixty-four million, one hundred six thousand, six hundred seventy-two".