138891688004 has 12 divisors (see below), whose sum is σ = 243100258044. Its totient is φ = 69434471424.

The previous prime is 138891687997. The next prime is 138891688021. The reversal of 138891688004 is 400886198831.

It can be written as a sum of positive squares in 2 ways, for example, as 33708225604 + 105183462400 = 183598^2 + 324320^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2815637 + ... + 2864540.

It is an arithmetic number, because the mean of its divisors is an integer number (20258354837).

Almost surely, 2^138891688004 is an apocalyptic number.

It is an amenable number.

138891688004 is a deficient number, since it is larger than the sum of its proper divisors (104208570040).

138891688004 is a wasteful number, since it uses less digits than its factorization.

138891688004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5686294 (or 5686292 counting only the distinct ones).

The product of its (nonzero) digits is 2654208, while the sum is 56.

The spelling of 138891688004 in words is "one hundred thirty-eight billion, eight hundred ninety-one million, six hundred eighty-eight thousand, four".