664619744875 has 16 divisors (see below), whose sum is σ = 831177135360. Its totient is φ = 530585736000.

The previous prime is 664619744861. The next prime is 664619744903. The reversal of 664619744875 is 578447916466.

It is not a de Polignac number, because 664619744875 - 2⁵ = 664619744843 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 664619744875.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5490186 + ... + 5609935.

It is an arithmetic number, because the mean of its divisors is an integer number (51948570960).

Almost surely, 2^664619744875 is an apocalyptic number.

664619744875 is a deficient number, since it is larger than the sum of its proper divisors (166557390485).

664619744875 is a wasteful number, since it uses less digits than its factorization.

664619744875 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11100615 (or 11100605 counting only the distinct ones).

The product of its digits is 243855360, while the sum is 67.

The spelling of 664619744875 in words is "six hundred sixty-four billion, six hundred nineteen million, seven hundred forty-four thousand, eight hundred seventy-five".