138933669540 has 48 divisors (see below), whose sum is σ = 395391568320. Its totient is φ = 36441617280.

The previous prime is 138933669509. The next prime is 138933669551. The reversal of 138933669540 is 45966339831.

It is a happy 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, 18976350 + ... + 18983669.

It is an arithmetic number, because the mean of its divisors is an integer number (8237324340).

Almost surely, 2^138933669540 is an apocalyptic number.

138933669540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

138933669540 is an abundant number, since it is smaller than the sum of its proper divisors (256457898780).

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

138933669540 is a wasteful number, since it uses less digits than its factorization.

138933669540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37960092 (or 37960090 counting only the distinct ones).

The product of its (nonzero) digits is 12597120, while the sum is 57.

The spelling of 138933669540 in words is "one hundred thirty-eight billion, nine hundred thirty-three million, six hundred sixty-nine thousand, five hundred forty".