18189938323 has 2 divisors, whose sum is σ = 18189938324. Its totient is φ = 18189938322.

The previous prime is 18189938297. The next prime is 18189938359. The reversal of 18189938323 is 32383998181.

It is a weak prime.

It is an emirp because it is prime and its reverse (32383998181) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18189938323 - 2²¹ = 18187841171 is a prime.

It is not a weakly prime, because it can be changed into another prime (18189938023) 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, 9094969161 + 9094969162.

It is an arithmetic number, because the mean of its divisors is an integer number (9094969162).

Almost surely, 2^18189938323 is an apocalyptic number.

18189938323 is a deficient number, since it is larger than the sum of its proper divisors (1).

18189938323 is an equidigital number, since it uses as much as digits as its factorization.

18189938323 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2239488, while the sum is 55.

The spelling of 18189938323 in words is "eighteen billion, one hundred eighty-nine million, nine hundred thirty-eight thousand, three hundred twenty-three".