12111995925817 has 2 divisors, whose sum is σ = 12111995925818. Its totient is φ = 12111995925816.

The previous prime is 12111995925811. The next prime is 12111995925829. The reversal of 12111995925817 is 71852959911121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6637687529641 + 5474308396176 = 2576371^2 + 2339724^2 .

It is a cyclic number.

It is not a de Polignac number, because 12111995925817 - 2³¹ = 12109848442169 is a prime.

It is not a weakly prime, because it can be changed into another prime (12111995925811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6055997962908 + 6055997962909.

It is an arithmetic number, because the mean of its divisors is an integer number (6055997962909).

Almost surely, 2^{12111995925817} is an apocalyptic number.

It is an amenable number.

12111995925817 is a deficient number, since it is larger than the sum of its proper divisors (1).

12111995925817 is an equidigital number, since it uses as much as digits as its factorization.

12111995925817 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4082400, while the sum is 61.

The spelling of 12111995925817 in words is "twelve trillion, one hundred eleven billion, nine hundred ninety-five million, nine hundred twenty-five thousand, eight hundred seventeen".