138338178468 has 72 divisors (see below), whose sum is σ = 375570260352. Its totient is φ = 39516676416.

The previous prime is 138338178439. The next prime is 138338178481. The reversal of 138338178468 is 864871833831.

It is a happy number.

It is a Smith number, since the sum of its digits (60) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3015430 + ... + 3060962.

It is an arithmetic number, because the mean of its divisors is an integer number (5216253616).

Almost surely, 2^138338178468 is an apocalyptic number.

It is an amenable number.

138338178468 is an abundant number, since it is smaller than the sum of its proper divisors (237232081884).

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

138338178468 is a wasteful number, since it uses less digits than its factorization.

138338178468 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50721 (or 50712 counting only the distinct ones).

The product of its digits is 18579456, while the sum is 60.

The spelling of 138338178468 in words is "one hundred thirty-eight billion, three hundred thirty-eight million, one hundred seventy-eight thousand, four hundred sixty-eight".