138171268020 has 48 divisors (see below), whose sum is σ = 388823702400. Its totient is φ = 36660514176.

The previous prime is 138171268003. The next prime is 138171268031. The reversal of 138171268020 is 20862171831.

It is a self number, because there is not a number n which added to its sum of digits gives 138171268020.

It is a congruent number.

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, 5774127 + ... + 5798006.

It is an arithmetic number, because the mean of its divisors is an integer number (8100493800).

Almost surely, 2^138171268020 is an apocalyptic number.

138171268020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

138171268020 is an abundant number, since it is smaller than the sum of its proper divisors (250652434380).

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

138171268020 is a wasteful number, since it uses less digits than its factorization.

138171268020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11572344 (or 11572342 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 39.

The spelling of 138171268020 in words is "one hundred thirty-eight billion, one hundred seventy-one million, two hundred sixty-eight thousand, twenty".