664604528525 has 36 divisors (see below), whose sum is σ = 972966574368. Its totient is φ = 448926841440.

The previous prime is 664604528507. The next prime is 664604528537. The reversal of 664604528525 is 525825406466.

It is not a de Polignac number, because 664604528525 - 2¹⁰ = 664604527501 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 3966689 + ... + 4130838.

It is an arithmetic number, because the mean of its divisors is an integer number (27026849288).

Almost surely, 2^664604528525 is an apocalyptic number.

It is an amenable number.

664604528525 is a deficient number, since it is larger than the sum of its proper divisors (308362045843).

664604528525 is a wasteful number, since it uses less digits than its factorization.

664604528525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8097618 (or 8097606 counting only the distinct ones).

The product of its (nonzero) digits is 13824000, while the sum is 53.

The spelling of 664604528525 in words is "six hundred sixty-four billion, six hundred four million, five hundred twenty-eight thousand, five hundred twenty-five".