18636064009 has 2 divisors, whose sum is σ = 18636064010. Its totient is φ = 18636064008.

The previous prime is 18636063977. The next prime is 18636064079. The reversal of 18636064009 is 90046063681.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12572015625 + 6064048384 = 112125^2 + 77872^2 .

It is a cyclic number.

It is not a de Polignac number, because 18636064009 - 2⁵ = 18636063977 is a prime.

It is not a weakly prime, because it can be changed into another prime (18636064079) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9318032004 + 9318032005.

It is an arithmetic number, because the mean of its divisors is an integer number (9318032005).

Almost surely, 2^18636064009 is an apocalyptic number.

It is an amenable number.

18636064009 is a deficient number, since it is larger than the sum of its proper divisors (1).

18636064009 is an equidigital number, since it uses as much as digits as its factorization.

18636064009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 186624, while the sum is 43.

The spelling of 18636064009 in words is "eighteen billion, six hundred thirty-six million, sixty-four thousand, nine".