111660663806161 has 2 divisors, whose sum is σ = 111660663806162. Its totient is φ = 111660663806160.

The previous prime is 111660663806077. The next prime is 111660663806203. The reversal of 111660663806161 is 161608366066111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 99854952635025 + 11805711171136 = 9992745^2 + 3435944^2 .

It is a cyclic number.

It is not a de Polignac number, because 111660663806161 - 2¹¹ = 111660663804113 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 111660663806099 and 111660663806108.

It is not a weakly prime, because it can be changed into another prime (111660663801161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55830331903080 + 55830331903081.

It is an arithmetic number, because the mean of its divisors is an integer number (55830331903081).

Almost surely, 2^{111660663806161} is an apocalyptic number.

It is an amenable number.

111660663806161 is a deficient number, since it is larger than the sum of its proper divisors (1).

111660663806161 is an equidigital number, since it uses as much as digits as its factorization.

111660663806161 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1119744, while the sum is 52.

The spelling of 111660663806161 in words is "one hundred eleven trillion, six hundred sixty billion, six hundred sixty-three million, eight hundred six thousand, one hundred sixty-one".