138275972138 has 8 divisors (see below), whose sum is σ = 219614779332. Its totient is φ = 65071045696.

The previous prime is 138275972137. The next prime is 138275972173. The reversal of 138275972138 is 831279572831.

138275972138 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 131212746289 + 7063225849 = 362233^2 + 84043^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (138275972137) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2033470145 + ... + 2033470212.

Almost surely, 2^138275972138 is an apocalyptic number.

138275972138 is a deficient number, since it is larger than the sum of its proper divisors (81338807194).

138275972138 is a wasteful number, since it uses less digits than its factorization.

138275972138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4066940376.

The product of its digits is 5080320, while the sum is 56.

The spelling of 138275972138 in words is "one hundred thirty-eight billion, two hundred seventy-five million, nine hundred seventy-two thousand, one hundred thirty-eight".