664619875 has 8 divisors (see below), whose sum is σ = 829445760. Its totient is φ = 531695800.

The previous prime is 664619869. The next prime is 664619897. The reversal of 664619875 is 578916466.

It is not a de Polignac number, because 664619875 - 2⁵ = 664619843 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2658355 + ... + 2658604.

It is an arithmetic number, because the mean of its divisors is an integer number (103680720).

Almost surely, 2^664619875 is an apocalyptic number.

664619875 is a deficient number, since it is larger than the sum of its proper divisors (164825885).

664619875 is an equidigital number, since it uses as much as digits as its factorization.

664619875 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5316974 (or 5316964 counting only the distinct ones).

The product of its digits is 2177280, while the sum is 52.

The square root of 664619875 is about 25780.2225552845. Note that the first 3 decimals coincide. The cubic root of 664619875 is about 872.6855296299.

The spelling of 664619875 in words is "six hundred sixty-four million, six hundred nineteen thousand, eight hundred seventy-five".