18388435349 has 2 divisors, whose sum is σ = 18388435350. Its totient is φ = 18388435348.

The previous prime is 18388435319. The next prime is 18388435357. The reversal of 18388435349 is 94353488381.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11796132100 + 6592303249 = 108610^2 + 81193^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18388435349 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18388435294 and 18388435303.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18388435319) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9194217674 + 9194217675.

It is an arithmetic number, because the mean of its divisors is an integer number (9194217675).

Almost surely, 2^18388435349 is an apocalyptic number.

It is an amenable number.

18388435349 is a deficient number, since it is larger than the sum of its proper divisors (1).

18388435349 is an equidigital number, since it uses as much as digits as its factorization.

18388435349 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9953280, while the sum is 56.

The spelling of 18388435349 in words is "eighteen billion, three hundred eighty-eight million, four hundred thirty-five thousand, three hundred forty-nine".