638611556088 has 32 divisors (see below), whose sum is σ = 1741667880960. Its totient is φ = 193518653280.

The previous prime is 638611556071. The next prime is 638611556129. The reversal of 638611556088 is 880655116836.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1209491320 + ... + 1209491847.

It is an arithmetic number, because the mean of its divisors is an integer number (54427121280).

Almost surely, 2^638611556088 is an apocalyptic number.

It is an amenable number.

638611556088 is an abundant number, since it is smaller than the sum of its proper divisors (1103056324872).

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

638611556088 is a wasteful number, since it uses less digits than its factorization.

638611556088 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2418983187 (or 2418983183 counting only the distinct ones).

The product of its (nonzero) digits is 8294400, while the sum is 57.

The spelling of 638611556088 in words is "six hundred thirty-eight billion, six hundred eleven million, five hundred fifty-six thousand, eighty-eight".