18363636391 has 2 divisors, whose sum is σ = 18363636392. Its totient is φ = 18363636390.

The previous prime is 18363636323. The next prime is 18363636407. The reversal of 18363636391 is 19363636381.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18363636391 - 2²⁷ = 18229418663 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18363636091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9181818195 + 9181818196.

It is an arithmetic number, because the mean of its divisors is an integer number (9181818196).

Almost surely, 2^18363636391 is an apocalyptic number.

18363636391 is a deficient number, since it is larger than the sum of its proper divisors (1).

18363636391 is an equidigital number, since it uses as much as digits as its factorization.

18363636391 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1259712, while the sum is 49.

The spelling of 18363636391 in words is "eighteen billion, three hundred sixty-three million, six hundred thirty-six thousand, three hundred ninety-one".