638177555052 has 72 divisors (see below), whose sum is σ = 1696155137040. Its totient is φ = 202023400320.

The previous prime is 638177555039. The next prime is 638177555053. The reversal of 638177555052 is 250555771836.

638177555052 is a `hidden beast` number, since 6 + 3 + 8 + 17 + 75 + 550 + 5 + 2 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 638177555052.

It is not an unprimeable number, because it can be changed into a prime (638177555053) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4946818 + ... + 5074185.

Almost surely, 2^638177555052 is an apocalyptic number.

It is an amenable number.

638177555052 is an abundant number, since it is smaller than the sum of its proper divisors (1057977581988).

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

638177555052 is a wasteful number, since it uses less digits than its factorization.

638177555052 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10021103 (or 10021098 counting only the distinct ones).

The product of its (nonzero) digits is 8820000, while the sum is 54.

The spelling of 638177555052 in words is "six hundred thirty-eight billion, one hundred seventy-seven million, five hundred fifty-five thousand, fifty-two".