18191109182 has 32 divisors (see below), whose sum is σ = 29134041120. Its totient is φ = 8489041920.

The previous prime is 18191109179. The next prime is 18191109187. The reversal of 18191109182 is 28190119181.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18191109187) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1996457 + ... + 2005547.

It is an arithmetic number, because the mean of its divisors is an integer number (910438785).

Almost surely, 2^18191109182 is an apocalyptic number.

18191109182 is a deficient number, since it is larger than the sum of its proper divisors (10942931938).

18191109182 is a wasteful number, since it uses less digits than its factorization.

18191109182 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9596.

The product of its (nonzero) digits is 10368, while the sum is 41.

Subtracting 18191109182 from its reverse (28190119181), we obtain a palindrome (9999009999).

The spelling of 18191109182 in words is "eighteen billion, one hundred ninety-one million, one hundred nine thousand, one hundred eighty-two".