161611101566011 has 2 divisors, whose sum is σ = 161611101566012. Its totient is φ = 161611101566010.

The previous prime is 161611101565993. The next prime is 161611101566051. The reversal of 161611101566011 is 110665101116161.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 161611101566011 - 2²⁵ = 161611068011579 is a prime.

It is a super-2 number, since 2×161611101566011² (a number of 29 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (161611101566051) 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, 80805550783005 + 80805550783006.

It is an arithmetic number, because the mean of its divisors is an integer number (80805550783006).

Almost surely, 2^{161611101566011} is an apocalyptic number.

161611101566011 is a deficient number, since it is larger than the sum of its proper divisors (1).

161611101566011 is an equidigital number, since it uses as much as digits as its factorization.

161611101566011 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6480, while the sum is 37.

The spelling of 161611101566011 in words is "one hundred sixty-one trillion, six hundred eleven billion, one hundred one million, five hundred sixty-six thousand, eleven".