138569318917 has 2 divisors, whose sum is σ = 138569318918. Its totient is φ = 138569318916.

The previous prime is 138569318819. The next prime is 138569318947. The reversal of 138569318917 is 719813965831.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 100353369796 + 38215949121 = 316786^2 + 195489^2 .

It is a cyclic number.

It is not a de Polignac number, because 138569318917 - 2³⁵ = 104209580549 is a prime.

It is a super-2 number, since 2×138569318917² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138569318947) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69284659458 + 69284659459.

It is an arithmetic number, because the mean of its divisors is an integer number (69284659459).

Almost surely, 2^138569318917 is an apocalyptic number.

It is an amenable number.

138569318917 is a deficient number, since it is larger than the sum of its proper divisors (1).

138569318917 is an equidigital number, since it uses as much as digits as its factorization.

138569318917 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9797760, while the sum is 61.

The spelling of 138569318917 in words is "one hundred thirty-eight billion, five hundred sixty-nine million, three hundred eighteen thousand, nine hundred seventeen".