18986884859 has 16 divisors (see below), whose sum is σ = 20057345280. Its totient is φ = 17937717600.

The previous prime is 18986884841. The next prime is 18986884871. The reversal of 18986884859 is 95848868981.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18986884859 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18986884159) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 963584 + ... + 983090.

It is an arithmetic number, because the mean of its divisors is an integer number (1253584080).

Almost surely, 2^18986884859 is an apocalyptic number.

18986884859 is a deficient number, since it is larger than the sum of its proper divisors (1070460421).

18986884859 is a wasteful number, since it uses less digits than its factorization.

18986884859 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20050.

The product of its digits is 318504960, while the sum is 74.

The spelling of 18986884859 in words is "eighteen billion, nine hundred eighty-six million, eight hundred eighty-four thousand, eight hundred fifty-nine".