138613171986261 has 12 divisors (see below), whose sum is σ = 228821744231392. Its totient is φ = 79207526849256.

The previous prime is 138613171986251. The next prime is 138613171986283. The reversal of 138613171986261 is 162689171316831.

138613171986261 is a `hidden beast` number, since 1 + 3 + 8 + 613 + 1 + 7 + 1 + 9 + 8 + 6 + 2 + 6 + 1 = 666.

It is not a de Polignac number, because 138613171986261 - 2²⁶ = 138613104877397 is a prime.

It is a super-2 number, since 2×138613171986261² (a number of 29 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (63), and also a Moran number because the ratio is a prime number: 2200209079147 = 138613171986261 / (1 + 3 + 8 + 6 + 1 + 3 + 1 + 7 + 1 + 9 + 8 + 6 + 2 + 6 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138613171986251) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1100104539511 + ... + 1100104539636.

Almost surely, 2^{138613171986261} is an apocalyptic number.

It is an amenable number.

138613171986261 is a deficient number, since it is larger than the sum of its proper divisors (90208572245131).

138613171986261 is a wasteful number, since it uses less digits than its factorization.

138613171986261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2200209079160 (or 2200209079157 counting only the distinct ones).

The product of its digits is 15676416, while the sum is 63.

The spelling of 138613171986261 in words is "one hundred thirty-eight trillion, six hundred thirteen billion, one hundred seventy-one million, nine hundred eighty-six thousand, two hundred sixty-one".