138661389173 has 4 divisors (see below), whose sum is σ = 144690145248. Its totient is φ = 132632633100.

The previous prime is 138661389161. The next prime is 138661389179. The reversal of 138661389173 is 371983166831.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 138661389173 - 2²⁴ = 138644611957 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138661389179) 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, 3014378003 + ... + 3014378048.

It is an arithmetic number, because the mean of its divisors is an integer number (36172536312).

Almost surely, 2^138661389173 is an apocalyptic number.

It is an amenable number.

138661389173 is a deficient number, since it is larger than the sum of its proper divisors (6028756075).

138661389173 is an equidigital number, since it uses as much as digits as its factorization.

138661389173 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6028756074.

The product of its digits is 3919104, while the sum is 56.

The spelling of 138661389173 in words is "one hundred thirty-eight billion, six hundred sixty-one million, three hundred eighty-nine thousand, one hundred seventy-three".