18063351809 has 2 divisors, whose sum is σ = 18063351810. Its totient is φ = 18063351808.

The previous prime is 18063351763. The next prime is 18063351811. The reversal of 18063351809 is 90815336081.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18035684209 + 27667600 = 134297^2 + 5260^2 .

It is a cyclic number.

It is not a de Polignac number, because 18063351809 - 2¹⁶ = 18063286273 is a prime.

It is a Sophie Germain prime.

Together with 18063351811, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 18063351809.

It is not a weakly prime, because it can be changed into another prime (18063354809) 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, 9031675904 + 9031675905.

It is an arithmetic number, because the mean of its divisors is an integer number (9031675905).

Almost surely, 2^18063351809 is an apocalyptic number.

It is an amenable number.

18063351809 is a deficient number, since it is larger than the sum of its proper divisors (1).

18063351809 is an equidigital number, since it uses as much as digits as its factorization.

18063351809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 155520, while the sum is 44.

The spelling of 18063351809 in words is "eighteen billion, sixty-three million, three hundred fifty-one thousand, eight hundred nine".