111551616061 has 2 divisors, whose sum is σ = 111551616062. Its totient is φ = 111551616060.

The previous prime is 111551616041. The next prime is 111551616131. The reversal of 111551616061 is 160616155111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 91065132900 + 20486483161 = 301770^2 + 143131^2 .

It is an emirp because it is prime and its reverse (160616155111) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 111551616061 - 2⁷ = 111551615933 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111551616041) 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, 55775808030 + 55775808031.

It is an arithmetic number, because the mean of its divisors is an integer number (55775808031).

Almost surely, 2^111551616061 is an apocalyptic number.

It is an amenable number.

111551616061 is a deficient number, since it is larger than the sum of its proper divisors (1).

111551616061 is an equidigital number, since it uses as much as digits as its factorization.

111551616061 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5400, while the sum is 34.

The spelling of 111551616061 in words is "one hundred eleven billion, five hundred fifty-one million, six hundred sixteen thousand, sixty-one".