18930636863 has 2 divisors, whose sum is σ = 18930636864. Its totient is φ = 18930636862.

The previous prime is 18930636859. The next prime is 18930636899. The reversal of 18930636863 is 36863603981.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18930636863 - 2² = 18930636859 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18930636463) 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, 9465318431 + 9465318432.

It is an arithmetic number, because the mean of its divisors is an integer number (9465318432).

Almost surely, 2^18930636863 is an apocalyptic number.

18930636863 is a deficient number, since it is larger than the sum of its proper divisors (1).

18930636863 is an equidigital number, since it uses as much as digits as its factorization.

18930636863 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3359232, while the sum is 53.

The spelling of 18930636863 in words is "eighteen billion, nine hundred thirty million, six hundred thirty-six thousand, eight hundred sixty-three".