664564742108 has 48 divisors (see below), whose sum is σ = 1190115763200. Its totient is φ = 324560892864.

The previous prime is 664564742089. The next prime is 664564742123. The reversal of 664564742108 is 801247465466.

It is a self number, because there is not a number n which added to its sum of digits gives 664564742108.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 340976318 + ... + 340978266.

It is an arithmetic number, because the mean of its divisors is an integer number (24794078400).

Almost surely, 2^664564742108 is an apocalyptic number.

It is an amenable number.

664564742108 is a deficient number, since it is larger than the sum of its proper divisors (525551021092).

664564742108 is a wasteful number, since it uses less digits than its factorization.

664564742108 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4706 (or 4704 counting only the distinct ones).

The product of its (nonzero) digits is 7741440, while the sum is 53.

The spelling of 664564742108 in words is "six hundred sixty-four billion, five hundred sixty-four million, seven hundred forty-two thousand, one hundred eight".