138648638856 has 64 divisors (see below), whose sum is σ = 426611203200. Its totient is φ = 36566673408.

The previous prime is 138648638851. The next prime is 138648638873. The reversal of 138648638856 is 658836846831.

It is not an unprimeable number, because it can be changed into a prime (138648638851) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31739721 + ... + 31744088.

It is an arithmetic number, because the mean of its divisors is an integer number (6665800050).

Almost surely, 2^138648638856 is an apocalyptic number.

It is an amenable number.

138648638856 is an abundant number, since it is smaller than the sum of its proper divisors (287962564344).

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

138648638856 is a wasteful number, since it uses less digits than its factorization.

138648638856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63483838 (or 63483834 counting only the distinct ones).

The product of its digits is 159252480, while the sum is 66.

The spelling of 138648638856 in words is "one hundred thirty-eight billion, six hundred forty-eight million, six hundred thirty-eight thousand, eight hundred fifty-six".