18303744209 has 2 divisors, whose sum is σ = 18303744210. Its totient is φ = 18303744208.

The previous prime is 18303744169. The next prime is 18303744269. The reversal of 18303744209 is 90244730381.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15958763584 + 2344980625 = 126328^2 + 48425^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18303744209 is a prime.

It is not a weakly prime, because it can be changed into another prime (18303744269) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9151872104 + 9151872105.

It is an arithmetic number, because the mean of its divisors is an integer number (9151872105).

Almost surely, 2^18303744209 is an apocalyptic number.

It is an amenable number.

18303744209 is a deficient number, since it is larger than the sum of its proper divisors (1).

18303744209 is an equidigital number, since it uses as much as digits as its factorization.

18303744209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 145152, while the sum is 41.

The spelling of 18303744209 in words is "eighteen billion, three hundred three million, seven hundred forty-four thousand, two hundred nine".