12111185717 has 2 divisors, whose sum is σ = 12111185718. Its totient is φ = 12111185716.

The previous prime is 12111185689. The next prime is 12111185731. The reversal of 12111185717 is 71758111121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11075247121 + 1035938596 = 105239^2 + 32186^2 .

It is a cyclic number.

It is not a de Polignac number, because 12111185717 - 2⁸ = 12111185461 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12111185777) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6055592858 + 6055592859.

It is an arithmetic number, because the mean of its divisors is an integer number (6055592859).

Almost surely, 2^12111185717 is an apocalyptic number.

It is an amenable number.

12111185717 is a deficient number, since it is larger than the sum of its proper divisors (1).

12111185717 is an equidigital number, since it uses as much as digits as its factorization.

12111185717 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3920, while the sum is 35.

Adding to 12111185717 its reverse (71758111121), we get a palindrome (83869296838).

The spelling of 12111185717 in words is "twelve billion, one hundred eleven million, one hundred eighty-five thousand, seven hundred seventeen".