18361967513 has 2 divisors, whose sum is σ = 18361967514. Its totient is φ = 18361967512.

The previous prime is 18361967471. The next prime is 18361967557. The reversal of 18361967513 is 31576916381.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15077875264 + 3284092249 = 122792^2 + 57307^2 .

It is an emirp because it is prime and its reverse (31576916381) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18361967513 - 2²⁰ = 18360918937 is a prime.

It is not a weakly prime, because it can be changed into another prime (18361969513) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9180983756 + 9180983757.

It is an arithmetic number, because the mean of its divisors is an integer number (9180983757).

Almost surely, 2^18361967513 is an apocalyptic number.

It is an amenable number.

18361967513 is a deficient number, since it is larger than the sum of its proper divisors (1).

18361967513 is an equidigital number, since it uses as much as digits as its factorization.

18361967513 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 816480, while the sum is 50.

The spelling of 18361967513 in words is "eighteen billion, three hundred sixty-one million, nine hundred sixty-seven thousand, five hundred thirteen".