18304428013 has 2 divisors, whose sum is σ = 18304428014. Its totient is φ = 18304428012.

The previous prime is 18304428001. The next prime is 18304428049. The reversal of 18304428013 is 31082440381.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17015115364 + 1289312649 = 130442^2 + 35907^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18304428013 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18304428013.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18304428083) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9152214006 + 9152214007.

It is an arithmetic number, because the mean of its divisors is an integer number (9152214007).

Almost surely, 2^18304428013 is an apocalyptic number.

It is an amenable number.

18304428013 is a deficient number, since it is larger than the sum of its proper divisors (1).

18304428013 is an equidigital number, since it uses as much as digits as its factorization.

18304428013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18432, while the sum is 34.

Adding to 18304428013 its reverse (31082440381), we get a palindrome (49386868394).

The spelling of 18304428013 in words is "eighteen billion, three hundred four million, four hundred twenty-eight thousand, thirteen".