638584863216 has 40 divisors (see below), whose sum is σ = 1649820287184. Its totient is φ = 212843205120.

The previous prime is 638584863181. The next prime is 638584863299. The reversal of 638584863216 is 612368485836.

It is a self number, because there is not a number n which added to its sum of digits gives 638584863216.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9165 + ... + 1130156.

Almost surely, 2^638584863216 is an apocalyptic number.

It is an amenable number.

638584863216 is an abundant number, since it is smaller than the sum of its proper divisors (1011235423968).

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

638584863216 is a wasteful number, since it uses less digits than its factorization.

638584863216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1151009 (or 1151003 counting only the distinct ones).

The product of its digits is 39813120, while the sum is 60.

The spelling of 638584863216 in words is "six hundred thirty-eight billion, five hundred eighty-four million, eight hundred sixty-three thousand, two hundred sixteen".