138655808140 has 24 divisors (see below), whose sum is σ = 291656921472. Its totient is φ = 55370947200.

The previous prime is 138655808129. The next prime is 138655808141. The reversal of 138655808140 is 41808556831.

It is not an unprimeable number, because it can be changed into a prime (138655808141) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5698561 + ... + 5722840.

It is an arithmetic number, because the mean of its divisors is an integer number (12152371728).

Almost surely, 2^138655808140 is an apocalyptic number.

138655808140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

138655808140 is an abundant number, since it is smaller than the sum of its proper divisors (153001113332).

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

138655808140 is a wasteful number, since it uses less digits than its factorization.

138655808140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11422017 (or 11422015 counting only the distinct ones).

The product of its (nonzero) digits is 921600, while the sum is 49.

The spelling of 138655808140 in words is "one hundred thirty-eight billion, six hundred fifty-five million, eight hundred eight thousand, one hundred forty".