638012135074 has 8 divisors (see below), whose sum is σ = 957370963500. Its totient is φ = 318888480576.

The previous prime is 638012135071. The next prime is 638012135093. The reversal of 638012135074 is 470531210836.

It can be written as a sum of positive squares in 2 ways, for example, as 637961625625 + 50509449 = 798725^2 + 7107^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (638012135071) 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, 58786699 + ... + 58797550.

Almost surely, 2^638012135074 is an apocalyptic number.

638012135074 is a deficient number, since it is larger than the sum of its proper divisors (319358828426).

638012135074 is a wasteful number, since it uses less digits than its factorization.

638012135074 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117586964.

The product of its (nonzero) digits is 120960, while the sum is 40.

The spelling of 638012135074 in words is "six hundred thirty-eight billion, twelve million, one hundred thirty-five thousand, seventy-four".