111011155161161 has 2 divisors, whose sum is σ = 111011155161162. Its totient is φ = 111011155161160.

The previous prime is 111011155161139. The next prime is 111011155161163. The reversal of 111011155161161 is 161161551110111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 86646664279561 + 24364490881600 = 9308419^2 + 4936040^2 .

It is a cyclic number.

It is not a de Polignac number, because 111011155161161 - 2¹⁸ = 111011154899017 is a prime.

Together with 111011155161163, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (111011155161163) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55505577580580 + 55505577580581.

It is an arithmetic number, because the mean of its divisors is an integer number (55505577580581).

Almost surely, 2^{111011155161161} is an apocalyptic number.

It is an amenable number.

111011155161161 is a deficient number, since it is larger than the sum of its proper divisors (1).

111011155161161 is an equidigital number, since it uses as much as digits as its factorization.

111011155161161 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 900, while the sum is 32.

The spelling of 111011155161161 in words is "one hundred eleven trillion, eleven billion, one hundred fifty-five million, one hundred sixty-one thousand, one hundred sixty-one".