111065555561 has 2 divisors, whose sum is σ = 111065555562. Its totient is φ = 111065555560.

The previous prime is 111065555551. The next prime is 111065555617. The reversal of 111065555561 is 165555560111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 84425113600 + 26640441961 = 290560^2 + 163219^2 .

It is an emirp because it is prime and its reverse (165555560111) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-111065555561 is a prime.

It is not a weakly prime, because it can be changed into another prime (111065555501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55532777780 + 55532777781.

It is an arithmetic number, because the mean of its divisors is an integer number (55532777781).

Almost surely, 2^111065555561 is an apocalyptic number.

It is an amenable number.

111065555561 is a deficient number, since it is larger than the sum of its proper divisors (1).

111065555561 is an equidigital number, since it uses as much as digits as its factorization.

111065555561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 112500, while the sum is 41.

The spelling of 111065555561 in words is "one hundred eleven billion, sixty-five million, five hundred fifty-five thousand, five hundred sixty-one".