18919583818 has 12 divisors (see below), whose sum is σ = 29359600470. Its totient is φ = 9133086480.

The previous prime is 18919583791. The next prime is 18919583833. The reversal of 18919583818 is 81838591981.

It can be written as a sum of positive squares in 3 ways, for example, as 18880683649 + 38900169 = 137407^2 + 6237^2 .

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 1038508 + ... + 1056568.

Almost surely, 2^18919583818 is an apocalyptic number.

18919583818 is a deficient number, since it is larger than the sum of its proper divisors (10440016652).

18919583818 is an frugal number, since it uses more digits than its factorization.

18919583818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36153 (or 18092 counting only the distinct ones).

The product of its digits is 4976640, while the sum is 61.

The spelling of 18919583818 in words is "eighteen billion, nine hundred nineteen million, five hundred eighty-three thousand, eight hundred eighteen".