18324824209 has 2 divisors, whose sum is σ = 18324824210. Its totient is φ = 18324824208.

The previous prime is 18324824137. The next prime is 18324824249. The reversal of 18324824209 is 90242842381.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17704963600 + 619860609 = 133060^2 + 24897^2 .

It is a cyclic number.

It is not a de Polignac number, because 18324824209 - 2¹⁷ = 18324693137 is a prime.

It is not a weakly prime, because it can be changed into another prime (18324824249) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9162412104 + 9162412105.

It is an arithmetic number, because the mean of its divisors is an integer number (9162412105).

Almost surely, 2^18324824209 is an apocalyptic number.

It is an amenable number.

18324824209 is a deficient number, since it is larger than the sum of its proper divisors (1).

18324824209 is an equidigital number, since it uses as much as digits as its factorization.

18324824209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 221184, while the sum is 43.

The spelling of 18324824209 in words is "eighteen billion, three hundred twenty-four million, eight hundred twenty-four thousand, two hundred nine".