638600334856 has 16 divisors (see below), whose sum is σ = 1306227957840. Its totient is φ = 290272879440.

The previous prime is 638600334839. The next prime is 638600334863. The reversal of 638600334856 is 658433006836.

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 3 ways as a sum of consecutive naturals, for example, 3628410906 + ... + 3628411081.

It is an arithmetic number, because the mean of its divisors is an integer number (81639247365).

Almost surely, 2^638600334856 is an apocalyptic number.

It is an amenable number.

638600334856 is an abundant number, since it is smaller than the sum of its proper divisors (667627622984).

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

638600334856 is a wasteful number, since it uses less digits than its factorization.

638600334856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7256822004 (or 7256822000 counting only the distinct ones).

The product of its (nonzero) digits is 7464960, while the sum is 52.

The spelling of 638600334856 in words is "six hundred thirty-eight billion, six hundred million, three hundred thirty-four thousand, eight hundred fifty-six".