138001594881 has 32 divisors (see below), whose sum is σ = 193726245888. Its totient is φ = 87260958720.

The previous prime is 138001594879. The next prime is 138001594937. The reversal of 138001594881 is 188495100831.

It is a happy number.

It is not a de Polignac number, because 138001594881 - 2¹ = 138001594879 is a prime.

It is a super-2 number, since 2×138001594881² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 138001594881.

It is not an unprimeable number, because it can be changed into a prime (138001594681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4801305 + ... + 4829961.

It is an arithmetic number, because the mean of its divisors is an integer number (6053945184).

Almost surely, 2^138001594881 is an apocalyptic number.

It is an amenable number.

138001594881 is a deficient number, since it is larger than the sum of its proper divisors (55724651007).

138001594881 is a wasteful number, since it uses less digits than its factorization.

138001594881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29721.

The product of its (nonzero) digits is 276480, while the sum is 48.

The spelling of 138001594881 in words is "one hundred thirty-eight billion, one million, five hundred ninety-four thousand, eight hundred eighty-one".