138905061218 has 32 divisors (see below), whose sum is σ = 275051127168. Its totient is φ = 50935392000.

The previous prime is 138905061209. The next prime is 138905061257. The reversal of 138905061218 is 812160509831.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26526233 + ... + 26531468.

It is an arithmetic number, because the mean of its divisors is an integer number (8595347724).

Almost surely, 2^138905061218 is an apocalyptic number.

138905061218 is a deficient number, since it is larger than the sum of its proper divisors (136146065950).

138905061218 is a wasteful number, since it uses less digits than its factorization.

138905061218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53057738.

The product of its (nonzero) digits is 103680, while the sum is 44.

The spelling of 138905061218 in words is "one hundred thirty-eight billion, nine hundred five million, sixty-one thousand, two hundred eighteen".