638372758652 has 24 divisors (see below), whose sum is σ = 1117893353472. Its totient is φ = 318974735600.

The previous prime is 638372758633. The next prime is 638372758763. The reversal of 638372758652 is 256857273836.

638372758652 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, 55645277 + ... + 55656747.

It is an arithmetic number, because the mean of its divisors is an integer number (46578889728).

Almost surely, 2^638372758652 is an apocalyptic number.

It is an amenable number.

638372758652 is a deficient number, since it is larger than the sum of its proper divisors (479520594820).

638372758652 is a wasteful number, since it uses less digits than its factorization.

638372758652 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19489 (or 19487 counting only the distinct ones).

The product of its digits is 101606400, while the sum is 62.

The spelling of 638372758652 in words is "six hundred thirty-eight billion, three hundred seventy-two million, seven hundred fifty-eight thousand, six hundred fifty-two".