638583223168 has 64 divisors (see below), whose sum is σ = 1397021408640. Its totient is φ = 288342720000.

The previous prime is 638583223139. The next prime is 638583223189. The reversal of 638583223168 is 861322385836.

It is a tau number, because it is divible by the number of its divisors (64).

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 1289178 + ... + 1714393.

It is an arithmetic number, because the mean of its divisors is an integer number (21828459510).

Almost surely, 2^638583223168 is an apocalyptic number.

It is an amenable number.

638583223168 is an abundant number, since it is smaller than the sum of its proper divisors (758438185472).

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

638583223168 is a wasteful number, since it uses less digits than its factorization.

638583223168 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3003747 (or 3003735 counting only the distinct ones).

The product of its digits is 9953280, while the sum is 55.

The spelling of 638583223168 in words is "six hundred thirty-eight billion, five hundred eighty-three million, two hundred twenty-three thousand, one hundred sixty-eight".