18256599061 has 2 divisors, whose sum is σ = 18256599062. Its totient is φ = 18256599060.

The previous prime is 18256599041. The next prime is 18256599077. The reversal of 18256599061 is 16099565281.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17984151025 + 272448036 = 134105^2 + 16506^2 .

It is an emirp because it is prime and its reverse (16099565281) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18256599061 - 2⁵ = 18256599029 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18256599041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9128299530 + 9128299531.

It is an arithmetic number, because the mean of its divisors is an integer number (9128299531).

Almost surely, 2^18256599061 is an apocalyptic number.

It is an amenable number.

18256599061 is a deficient number, since it is larger than the sum of its proper divisors (1).

18256599061 is an equidigital number, since it uses as much as digits as its factorization.

18256599061 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1166400, while the sum is 52.

The spelling of 18256599061 in words is "eighteen billion, two hundred fifty-six million, five hundred ninety-nine thousand, sixty-one".