18799886889 has 90 divisors (see below), whose sum is σ = 34481427354. Its totient is φ = 10176606720.

The previous prime is 18799886843. The next prime is 18799886923. The reversal of 18799886889 is 98868899781.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 12931101225 + 5868785664 = 113715^2 + 76608^2 .

It is not a de Polignac number, because 18799886889 - 2⁷ = 18799886761 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (81).

It is not an unprimeable number, because it can be changed into a prime (18799886489) 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 in 89 ways as a sum of consecutive naturals, for example, 1426249 + ... + 1439369.

Almost surely, 2^18799886889 is an apocalyptic number.

18799886889 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

18799886889 is a deficient number, since it is larger than the sum of its proper divisors (15681540465).

18799886889 is a wasteful number, since it uses less digits than its factorization.

18799886889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13185 (or 13150 counting only the distinct ones).

The product of its digits is 1003290624, while the sum is 81.

The spelling of 18799886889 in words is "eighteen billion, seven hundred ninety-nine million, eight hundred eighty-six thousand, eight hundred eighty-nine".