664694885 has 8 divisors (see below), whose sum is σ = 811153440. Its totient is φ = 522742864.

The previous prime is 664694869. The next prime is 664694909. The reversal of 664694885 is 588496466.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 664694885 - 2⁴ = 664694869 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 664694885.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1126307 + ... + 1126896.

It is an arithmetic number, because the mean of its divisors is an integer number (101394180).

Almost surely, 2^664694885 is an apocalyptic number.

It is an amenable number.

664694885 is a deficient number, since it is larger than the sum of its proper divisors (146458555).

664694885 is a wasteful number, since it uses less digits than its factorization.

664694885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2253267.

The product of its digits is 9953280, while the sum is 56.

The square root of 664694885 is about 25781.6773116103. The cubic root of 664694885 is about 872.7183592626.

The spelling of 664694885 in words is "six hundred sixty-four million, six hundred ninety-four thousand, eight hundred eighty-five".