138775626440 has 32 divisors (see below), whose sum is σ = 340631084160. Its totient is φ = 50463864000.

The previous prime is 138775626439. The next prime is 138775626487. The reversal of 138775626440 is 44626577831.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 157699136 + ... + 157700015.

It is an arithmetic number, because the mean of its divisors is an integer number (10644721380).

Almost surely, 2^138775626440 is an apocalyptic number.

138775626440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

138775626440 is an abundant number, since it is smaller than the sum of its proper divisors (201855457720).

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

138775626440 is a wasteful number, since it uses less digits than its factorization.

138775626440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 315399173 (or 315399169 counting only the distinct ones).

The product of its (nonzero) digits is 6773760, while the sum is 53.

The spelling of 138775626440 in words is "one hundred thirty-eight billion, seven hundred seventy-five million, six hundred twenty-six thousand, four hundred forty".