111661135361 has 2 divisors, whose sum is σ = 111661135362. Its totient is φ = 111661135360.

The previous prime is 111661135301. The next prime is 111661135363. The reversal of 111661135361 is 163531166111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 97703130625 + 13958004736 = 312575^2 + 118144^2 .

It is a cyclic number.

It is not a de Polignac number, because 111661135361 - 2⁶ = 111661135297 is a prime.

Together with 111661135363, 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 (111661135363) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55830567680 + 55830567681.

It is an arithmetic number, because the mean of its divisors is an integer number (55830567681).

Almost surely, 2^111661135361 is an apocalyptic number.

It is an amenable number.

111661135361 is a deficient number, since it is larger than the sum of its proper divisors (1).

111661135361 is an equidigital number, since it uses as much as digits as its factorization.

111661135361 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9720, while the sum is 35.

The spelling of 111661135361 in words is "one hundred eleven billion, six hundred sixty-one million, one hundred thirty-five thousand, three hundred sixty-one".