18507086393 has 2 divisors, whose sum is σ = 18507086394. Its totient is φ = 18507086392.

The previous prime is 18507086357. The next prime is 18507086441. The reversal of 18507086393 is 39368070581.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15224598544 + 3282487849 = 123388^2 + 57293^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18507086393 is a prime.

It is not a weakly prime, because it can be changed into another prime (18507086333) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9253543196 + 9253543197.

It is an arithmetic number, because the mean of its divisors is an integer number (9253543197).

Almost surely, 2^18507086393 is an apocalyptic number.

It is an amenable number.

18507086393 is a deficient number, since it is larger than the sum of its proper divisors (1).

18507086393 is an equidigital number, since it uses as much as digits as its factorization.

18507086393 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1088640, while the sum is 50.

The spelling of 18507086393 in words is "eighteen billion, five hundred seven million, eighty-six thousand, three hundred ninety-three".