12111611665171 has 2 divisors, whose sum is σ = 12111611665172. Its totient is φ = 12111611665170.

The previous prime is 12111611665157. The next prime is 12111611665271. The reversal of 12111611665171 is 17156611611121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 12111611665171 - 2²⁵ = 12111578110739 is a prime.

It is a super-2 number, since 2×12111611665171² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (12111611665271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6055805832585 + 6055805832586.

It is an arithmetic number, because the mean of its divisors is an integer number (6055805832586).

Almost surely, 2^{12111611665171} is an apocalyptic number.

12111611665171 is a deficient number, since it is larger than the sum of its proper divisors (1).

12111611665171 is an equidigital number, since it uses as much as digits as its factorization.

12111611665171 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15120, while the sum is 40.

The spelling of 12111611665171 in words is "twelve trillion, one hundred eleven billion, six hundred eleven million, six hundred sixty-five thousand, one hundred seventy-one".