138661389179 has 2 divisors, whose sum is σ = 138661389180. Its totient is φ = 138661389178.

The previous prime is 138661389161. The next prime is 138661389187. The reversal of 138661389179 is 971983166831.

138661389179 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-138661389179 is a prime.

It is not a weakly prime, because it can be changed into another prime (138661329179) 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 as a sum of consecutive naturals, namely, 69330694589 + 69330694590.

It is an arithmetic number, because the mean of its divisors is an integer number (69330694590).

Almost surely, 2^138661389179 is an apocalyptic number.

138661389179 is a deficient number, since it is larger than the sum of its proper divisors (1).

138661389179 is an equidigital number, since it uses as much as digits as its factorization.

138661389179 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11757312, while the sum is 62.

The spelling of 138661389179 in words is "one hundred thirty-eight billion, six hundred sixty-one million, three hundred eighty-nine thousand, one hundred seventy-nine".