664129168 has 20 divisors (see below), whose sum is σ = 1299246208. Its totient is φ = 328839840.

The previous prime is 664129159. The next prime is 664129171. The reversal of 664129168 is 861921466.

664129168 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 199848 + ... + 203143.

Almost surely, 2^664129168 is an apocalyptic number.

It is an amenable number.

664129168 is a deficient number, since it is larger than the sum of its proper divisors (635117040).

664129168 is a wasteful number, since it uses less digits than its factorization.

664129168 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 403102 (or 403096 counting only the distinct ones).

The product of its digits is 124416, while the sum is 43.

The square root of 664129168 is about 25770.7036768498. The cubic root of 664129168 is about 872.4707008987.

The spelling of 664129168 in words is "six hundred sixty-four million, one hundred twenty-nine thousand, one hundred sixty-eight".