19816441186 has 4 divisors (see below), whose sum is σ = 29724661782. Its totient is φ = 9908220592.

The previous prime is 19816441163. The next prime is 19816441243. The reversal of 19816441186 is 68114461891.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 17521552161 + 2294889025 = 132369^2 + 47905^2 .

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

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 as a sum of consecutive naturals, namely, 4954110295 + ... + 4954110298.

Almost surely, 2^19816441186 is an apocalyptic number.

19816441186 is a deficient number, since it is larger than the sum of its proper divisors (9908220596).

19816441186 is an equidigital number, since it uses as much as digits as its factorization.

19816441186 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9908220595.

The product of its digits is 331776, while the sum is 49.

The spelling of 19816441186 in words is "nineteen billion, eight hundred sixteen million, four hundred forty-one thousand, one hundred eighty-six".