18733568809 has 2 divisors, whose sum is σ = 18733568810. Its totient is φ = 18733568808.

The previous prime is 18733568783. The next prime is 18733568911. The reversal of 18733568809 is 90886533781.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17214752025 + 1518816784 = 131205^2 + 38972^2 .

It is a cyclic number.

It is not a de Polignac number, because 18733568809 - 2¹⁹ = 18733044521 is a prime.

It is not a weakly prime, because it can be changed into another prime (18733569809) 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, 9366784404 + 9366784405.

It is an arithmetic number, because the mean of its divisors is an integer number (9366784405).

Almost surely, 2^18733568809 is an apocalyptic number.

It is an amenable number.

18733568809 is a deficient number, since it is larger than the sum of its proper divisors (1).

18733568809 is an equidigital number, since it uses as much as digits as its factorization.

18733568809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8709120, while the sum is 58.

The spelling of 18733568809 in words is "eighteen billion, seven hundred thirty-three million, five hundred sixty-eight thousand, eight hundred nine".