18191919182 has 32 divisors (see below), whose sum is σ = 28660348800. Its totient is φ = 8648640000.

The previous prime is 18191919173. The next prime is 18191919197. The reversal of 18191919182 is 28191919181.

It is a self number, because there is not a number n which added to its sum of digits gives 18191919182.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1832432 + ... + 1842332.

It is an arithmetic number, because the mean of its divisors is an integer number (895635900).

Almost surely, 2^18191919182 is an apocalyptic number.

18191919182 is a deficient number, since it is larger than the sum of its proper divisors (10468429618).

18191919182 is a wasteful number, since it uses less digits than its factorization.

18191919182 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10412.

The product of its digits is 93312, while the sum is 50.

Subtracting 18191919182 from its reverse (28191919181), we obtain a palindrome (9999999999).

The spelling of 18191919182 in words is "eighteen billion, one hundred ninety-one million, nine hundred nineteen thousand, one hundred eighty-two".