664710362825 has 24 divisors (see below), whose sum is σ = 826200244800. Its totient is φ = 530505005760.

The previous prime is 664710362779. The next prime is 664710362851. The reversal of 664710362825 is 528263017466.

It is a happy number.

It is not a de Polignac number, because 664710362825 - 2¹⁶ = 664710297289 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 37955171 + ... + 37972679.

It is an arithmetic number, because the mean of its divisors is an integer number (34425010200).

Almost surely, 2^664710362825 is an apocalyptic number.

It is an amenable number.

664710362825 is a deficient number, since it is larger than the sum of its proper divisors (161489881975).

664710362825 is a wasteful number, since it uses less digits than its factorization.

664710362825 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21041 (or 21036 counting only the distinct ones).

The product of its (nonzero) digits is 2903040, while the sum is 50.

The spelling of 664710362825 in words is "six hundred sixty-four billion, seven hundred ten million, three hundred sixty-two thousand, eight hundred twenty-five".