18985887819 has 12 divisors (see below), whose sum is σ = 27621357400. Its totient is φ = 12566198304.

The previous prime is 18985887799. The next prime is 18985887829. The reversal of 18985887819 is 91878858981.

It is not a de Polignac number, because 18985887819 - 2⁸ = 18985887563 is a prime.

It is a super-2 number, since 2×18985887819² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18985887829) 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 in 11 ways as a sum of consecutive naturals, for example, 7587034 + ... + 7589535.

Almost surely, 2^18985887819 is an apocalyptic number.

18985887819 is a deficient number, since it is larger than the sum of its proper divisors (8635469581).

18985887819 is a wasteful number, since it uses less digits than its factorization.

18985887819 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15176714 (or 15176711 counting only the distinct ones).

The product of its digits is 92897280, while the sum is 72.

The spelling of 18985887819 in words is "eighteen billion, nine hundred eighty-five million, eight hundred eighty-seven thousand, eight hundred nineteen".