638012135075 has 48 divisors (see below), whose sum is σ = 915519528000. Its totient is φ = 432007741440.

The previous prime is 638012135071. The next prime is 638012135093. The reversal of 638012135075 is 570531210836.

It is not a de Polignac number, because 638012135075 - 2² = 638012135071 is a prime.

It is not an unprimeable number, because it can be changed into a prime (638012135071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 11950541 + ... + 12003809.

It is an arithmetic number, because the mean of its divisors is an integer number (19073323500).

Almost surely, 2^638012135075 is an apocalyptic number.

638012135075 is a deficient number, since it is larger than the sum of its proper divisors (277507392925).

638012135075 is a wasteful number, since it uses less digits than its factorization.

638012135075 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54144 (or 54139 counting only the distinct ones).

The product of its (nonzero) digits is 151200, while the sum is 41.

The spelling of 638012135075 in words is "six hundred thirty-eight billion, twelve million, one hundred thirty-five thousand, seventy-five".