664033172 has 24 divisors (see below), whose sum is σ = 1280016192. Its totient is φ = 298900800.

The previous prime is 664033151. The next prime is 664033189. The reversal of 664033172 is 271330466.

664033172 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 68729 + ... + 77792.

It is an arithmetic number, because the mean of its divisors is an integer number (53334008).

Almost surely, 2^664033172 is an apocalyptic number.

It is an amenable number.

664033172 is a deficient number, since it is larger than the sum of its proper divisors (615983020).

664033172 is a wasteful number, since it uses less digits than its factorization.

664033172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146639 (or 146637 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 32.

The square root of 664033172 is about 25768.8411070424. The cubic root of 664033172 is about 872.4286620218.

The spelling of 664033172 in words is "six hundred sixty-four million, thirty-three thousand, one hundred seventy-two".