138775431584 has 48 divisors (see below), whose sum is σ = 279942397056. Its totient is φ = 67679731200.

The previous prime is 138775431583. The next prime is 138775431589. The reversal of 138775431584 is 485134577831.

It is a super-2 number, since 2×138775431584² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (138775431583) 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, 7399499 + ... + 7418229.

It is an arithmetic number, because the mean of its divisors is an integer number (5832133272).

Almost surely, 2^138775431584 is an apocalyptic number.

It is an amenable number.

138775431584 is an abundant number, since it is smaller than the sum of its proper divisors (141166965472).

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

138775431584 is a wasteful number, since it uses less digits than its factorization.

138775431584 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24429 (or 24421 counting only the distinct ones).

The product of its digits is 11289600, while the sum is 56.

The spelling of 138775431584 in words is "one hundred thirty-eight billion, seven hundred seventy-five million, four hundred thirty-one thousand, five hundred eighty-four".