18508358585 has 4 divisors (see below), whose sum is σ = 22210030308. Its totient is φ = 14806686864.

The previous prime is 18508358563. The next prime is 18508358639. The reversal of 18508358585 is 58585380581.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 12027947584 + 6480411001 = 109672^2 + 80501^2 .

It is a cyclic number.

It is not a de Polignac number, because 18508358585 - 2¹⁰ = 18508357561 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18508358585.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1850835854 + ... + 1850835863.

It is an arithmetic number, because the mean of its divisors is an integer number (5552507577).

Almost surely, 2^18508358585 is an apocalyptic number.

It is an amenable number.

18508358585 is a deficient number, since it is larger than the sum of its proper divisors (3701671723).

18508358585 is an equidigital number, since it uses as much as digits as its factorization.

18508358585 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3701671722.

The product of its (nonzero) digits is 7680000, while the sum is 56.

The spelling of 18508358585 in words is "eighteen billion, five hundred eight million, three hundred fifty-eight thousand, five hundred eighty-five".