138518987873 has 32 divisors (see below), whose sum is σ = 167240663040. Its totient is φ = 112242594240.

The previous prime is 138518987861. The next prime is 138518987897. The reversal of 138518987873 is 378789815831.

It is not a de Polignac number, because 138518987873 - 2³² = 134224020577 is a prime.

It is not an unprimeable number, because it can be changed into a prime (138518986873) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2094608 + ... + 2159726.

It is an arithmetic number, because the mean of its divisors is an integer number (5226270720).

Almost surely, 2^138518987873 is an apocalyptic number.

It is an amenable number.

138518987873 is a deficient number, since it is larger than the sum of its proper divisors (28721675167).

138518987873 is a wasteful number, since it uses less digits than its factorization.

138518987873 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65397.

The product of its digits is 81285120, while the sum is 68.

The spelling of 138518987873 in words is "one hundred thirty-eight billion, five hundred eighteen million, nine hundred eighty-seven thousand, eight hundred seventy-three".