138661389175 has 6 divisors (see below), whose sum is σ = 171940122608. Its totient is φ = 110929111320.

The previous prime is 138661389161. The next prime is 138661389179. The reversal of 138661389175 is 571983166831.

It is a happy number.

138661389175 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 138661389175 - 2⁵ = 138661389143 is a prime.

It is a Duffinian 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 pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2773227759 + ... + 2773227808.

Almost surely, 2^138661389175 is an apocalyptic number.

138661389175 is a deficient number, since it is larger than the sum of its proper divisors (33278733433).

138661389175 is an equidigital number, since it uses as much as digits as its factorization.

138661389175 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5546455577 (or 5546455572 counting only the distinct ones).

The product of its digits is 6531840, while the sum is 58.

It can be divided in two parts, 13866 and 1389175, that added together give a palindrome (1403041).

The spelling of 138661389175 in words is "one hundred thirty-eight billion, six hundred sixty-one million, three hundred eighty-nine thousand, one hundred seventy-five".