138115081960 has 64 divisors (see below), whose sum is σ = 327565929600. Its totient is φ = 52266145536.

The previous prime is 138115081939. The next prime is 138115081963. The reversal of 138115081960 is 69180511831.

It is not an unprimeable number, because it can be changed into a prime (138115081963) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 427534 + ... + 677506.

It is an arithmetic number, because the mean of its divisors is an integer number (5118217650).

Almost surely, 2^138115081960 is an apocalyptic number.

138115081960 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 138115081960, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (163782964800).

138115081960 is an abundant number, since it is smaller than the sum of its proper divisors (189450847640).

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

138115081960 is a wasteful number, since it uses less digits than its factorization.

138115081960 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 250730 (or 250726 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 43.

The spelling of 138115081960 in words is "one hundred thirty-eight billion, one hundred fifteen million, eighty-one thousand, nine hundred sixty".