138688754952 has 64 divisors (see below), whose sum is σ = 400491604800. Its totient is φ = 39554723840.

The previous prime is 138688754909. The next prime is 138688754957. The reversal of 138688754952 is 259457886831.

It is a Harshad number since it is a multiple of its sum of digits (66).

It is not an unprimeable number, because it can be changed into a prime (138688754957) 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, 15446577 + ... + 15455552.

It is an arithmetic number, because the mean of its divisors is an integer number (6257681325).

Almost surely, 2^138688754952 is an apocalyptic number.

138688754952 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

138688754952 is an abundant number, since it is smaller than the sum of its proper divisors (261802849848).

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

138688754952 is a wasteful number, since it uses less digits than its factorization.

138688754952 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30902166 (or 30902162 counting only the distinct ones).

The product of its digits is 116121600, while the sum is 66.

The spelling of 138688754952 in words is "one hundred thirty-eight billion, six hundred eighty-eight million, seven hundred fifty-four thousand, nine hundred fifty-two".