18087035809 has 2 divisors, whose sum is σ = 18087035810. Its totient is φ = 18087035808.

The previous prime is 18087035801. The next prime is 18087035819. The reversal of 18087035809 is 90853078081.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16686180625 + 1400855184 = 129175^2 + 37428^2 .

It is a cyclic number.

It is not a de Polignac number, because 18087035809 - 2³ = 18087035801 is a prime.

It is not a weakly prime, because it can be changed into another prime (18087035801) 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, 9043517904 + 9043517905.

It is an arithmetic number, because the mean of its divisors is an integer number (9043517905).

Almost surely, 2^18087035809 is an apocalyptic number.

It is an amenable number.

18087035809 is a deficient number, since it is larger than the sum of its proper divisors (1).

18087035809 is an equidigital number, since it uses as much as digits as its factorization.

18087035809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 483840, while the sum is 49.

The spelling of 18087035809 in words is "eighteen billion, eighty-seven million, thirty-five thousand, eight hundred nine".