138640918113 has 40 divisors (see below), whose sum is σ = 218394448800. Its totient is φ = 87406610112.

The previous prime is 138640918109. The next prime is 138640918121. The reversal of 138640918113 is 311819046831.

It is not a de Polignac number, because 138640918113 - 2² = 138640918109 is a prime.

It is not an unprimeable number, because it can be changed into a prime (138640918123) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 786453 + ... + 946461.

It is an arithmetic number, because the mean of its divisors is an integer number (5459861220).

Almost surely, 2^138640918113 is an apocalyptic number.

It is an amenable number.

138640918113 is a deficient number, since it is larger than the sum of its proper divisors (79753530687).

138640918113 is a wasteful number, since it uses less digits than its factorization.

138640918113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160603 (or 160594 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 45.

The spelling of 138640918113 in words is "one hundred thirty-eight billion, six hundred forty million, nine hundred eighteen thousand, one hundred thirteen".