138136315218 has 32 divisors (see below), whose sum is σ = 302125273920. Its totient is φ = 41757135360.

The previous prime is 138136315211. The next prime is 138136315241. The reversal of 138136315218 is 812513631831.

It is a self number, because there is not a number n which added to its sum of digits gives 138136315218.

It is not an unprimeable number, because it can be changed into a prime (138136315211) 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, 2531655 + ... + 2585642.

It is an arithmetic number, because the mean of its divisors is an integer number (9441414810).

Almost surely, 2^138136315218 is an apocalyptic number.

138136315218 is an abundant number, since it is smaller than the sum of its proper divisors (163988958702).

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

138136315218 is a wasteful number, since it uses less digits than its factorization.

138136315218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5117722.

The product of its digits is 103680, while the sum is 42.

It can be divided in two parts, 138136 and 315218, that added together give a palindrome (453354).

The spelling of 138136315218 in words is "one hundred thirty-eight billion, one hundred thirty-six million, three hundred fifteen thousand, two hundred eighteen".