664466172 has 24 divisors (see below), whose sum is σ = 1588237392. Its totient is φ = 216086400.

The previous prime is 664466167. The next prime is 664466189. The reversal of 664466172 is 271664466.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 674779 + ... + 675762.

It is an arithmetic number, because the mean of its divisors is an integer number (66176558).

Almost surely, 2^664466172 is an apocalyptic number.

It is an amenable number.

664466172 is an abundant number, since it is smaller than the sum of its proper divisors (923771220).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

664466172 is a wasteful number, since it uses less digits than its factorization.

664466172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1350589 (or 1350587 counting only the distinct ones).

The product of its digits is 290304, while the sum is 42.

The square root of 664466172 is about 25777.2413574455. The cubic root of 664466172 is about 872.6182507083.

The spelling of 664466172 in words is "six hundred sixty-four million, four hundred sixty-six thousand, one hundred seventy-two".