638137575132 has 48 divisors (see below), whose sum is σ = 1535612424192. Its totient is φ = 206129750400.

The previous prime is 638137575121. The next prime is 638137575137. The reversal of 638137575132 is 231575731836.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638137575137) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4803369 + ... + 4934432.

It is an arithmetic number, because the mean of its divisors is an integer number (31991925504).

Almost surely, 2^638137575132 is an apocalyptic number.

It is an amenable number.

638137575132 is an abundant number, since it is smaller than the sum of its proper divisors (897474849060).

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

638137575132 is a wasteful number, since it uses less digits than its factorization.

638137575132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9737978 (or 9737976 counting only the distinct ones).

The product of its digits is 3175200, while the sum is 51.

The spelling of 638137575132 in words is "six hundred thirty-eight billion, one hundred thirty-seven million, five hundred seventy-five thousand, one hundred thirty-two".