18189637913 has 2 divisors, whose sum is σ = 18189637914. Its totient is φ = 18189637912.

The previous prime is 18189637877. The next prime is 18189637919. The reversal of 18189637913 is 31973698181.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17720135689 + 469502224 = 133117^2 + 21668^2 .

It is a cyclic number.

It is not a de Polignac number, because 18189637913 - 2⁸ = 18189637657 is a prime.

It is not a weakly prime, because it can be changed into another prime (18189637919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9094818956 + 9094818957.

It is an arithmetic number, because the mean of its divisors is an integer number (9094818957).

Almost surely, 2^18189637913 is an apocalyptic number.

It is an amenable number.

18189637913 is a deficient number, since it is larger than the sum of its proper divisors (1).

18189637913 is an equidigital number, since it uses as much as digits as its factorization.

18189637913 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1959552, while the sum is 56.

The spelling of 18189637913 in words is "eighteen billion, one hundred eighty-nine million, six hundred thirty-seven thousand, nine hundred thirteen".