638597072056 has 16 divisors (see below), whose sum is σ = 1200227200200. Its totient is φ = 318536485344.

The previous prime is 638597072053. The next prime is 638597072117. The reversal of 638597072056 is 650270795836.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638597072051) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 95252775 + ... + 95259478.

Almost surely, 2^638597072056 is an apocalyptic number.

It is an amenable number.

638597072056 is a deficient number, since it is larger than the sum of its proper divisors (561630128144).

638597072056 is a wasteful number, since it uses less digits than its factorization.

638597072056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 190512678 (or 190512674 counting only the distinct ones).

The product of its (nonzero) digits is 19051200, while the sum is 58.

The spelling of 638597072056 in words is "six hundred thirty-eight billion, five hundred ninety-seven million, seventy-two thousand, fifty-six".