664444174400 has 42 divisors (see below), whose sum is σ = 1634947950570. Its totient is φ = 265777669120.

The previous prime is 664444174391. The next prime is 664444174421. The reversal of 664444174400 is 4471444466.

It can be written as a sum of positive squares in 3 ways, for example, as 6762101824 + 657682072576 = 82232^2 + 810976^2 .

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 5 ways as a sum of consecutive naturals, for example, 207637205 + ... + 207640404.

Almost surely, 2^664444174400 is an apocalyptic number.

It is an amenable number.

664444174400 is an abundant number, since it is smaller than the sum of its proper divisors (970503776170).

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

664444174400 is a wasteful number, since it uses less digits than its factorization.

664444174400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 415277631 (or 415277616 counting only the distinct ones).

The product of its (nonzero) digits is 1032192, while the sum is 44.

The spelling of 664444174400 in words is "six hundred sixty-four billion, four hundred forty-four million, one hundred seventy-four thousand, four hundred".