18938829911 has 2 divisors, whose sum is σ = 18938829912. Its totient is φ = 18938829910.

The previous prime is 18938829883. The next prime is 18938829941. The reversal of 18938829911 is 11992883981.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18938829911 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18938829941) 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, 9469414955 + 9469414956.

It is an arithmetic number, because the mean of its divisors is an integer number (9469414956).

Almost surely, 2^18938829911 is an apocalyptic number.

18938829911 is a deficient number, since it is larger than the sum of its proper divisors (1).

18938829911 is an equidigital number, since it uses as much as digits as its factorization.

18938829911 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2239488, while the sum is 59.

The spelling of 18938829911 in words is "eighteen billion, nine hundred thirty-eight million, eight hundred twenty-nine thousand, nine hundred eleven".