138338178464 has 24 divisors (see below), whose sum is σ = 281744783460. Its totient is φ = 66783947776.

The previous prime is 138338178439. The next prime is 138338178481. The reversal of 138338178464 is 464871833831.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 134556912400 + 3781266064 = 366820^2 + 61492^2 .

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, 74534729 + ... + 74536584.

Almost surely, 2^138338178464 is an apocalyptic number.

It is an amenable number.

138338178464 is an abundant number, since it is smaller than the sum of its proper divisors (143406604996).

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

138338178464 is a wasteful number, since it uses less digits than its factorization.

138338178464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149071352 (or 149071344 counting only the distinct ones).

The product of its digits is 9289728, while the sum is 56.

The spelling of 138338178464 in words is "one hundred thirty-eight billion, three hundred thirty-eight million, one hundred seventy-eight thousand, four hundred sixty-four".