638588655004 has 6 divisors (see below), whose sum is σ = 1117530146264. Its totient is φ = 319294327500.

The previous prime is 638588654989. The next prime is 638588655017. The reversal of 638588655004 is 400556885836.

It is a self number, because there is not a number n which added to its sum of digits gives 638588655004.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 79823581872 + ... + 79823581879.

Almost surely, 2^638588655004 is an apocalyptic number.

It is an amenable number.

638588655004 is a deficient number, since it is larger than the sum of its proper divisors (478941491260).

638588655004 is a wasteful number, since it uses less digits than its factorization.

638588655004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159647163755 (or 159647163753 counting only the distinct ones).

The product of its (nonzero) digits is 27648000, while the sum is 58.

The spelling of 638588655004 in words is "six hundred thirty-eight billion, five hundred eighty-eight million, six hundred fifty-five thousand, four".