19201819194 has 24 divisors (see below), whose sum is σ = 41671834932. Its totient is φ = 6390161280.

The previous prime is 19201819157. The next prime is 19201819199. The reversal of 19201819194 is 49191810291.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 11486480625 + 7715338569 = 107175^2 + 87837^2 .

It is not an unprimeable number, because it can be changed into a prime (19201819199) 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 11 ways as a sum of consecutive naturals, for example, 859087 + ... + 881154.

Almost surely, 2^19201819194 is an apocalyptic number.

19201819194 is an abundant number, since it is smaller than the sum of its proper divisors (22470015738).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

19201819194 is a wasteful number, since it uses less digits than its factorization.

19201819194 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1740862 (or 1740859 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 45.

The spelling of 19201819194 in words is "nineteen billion, two hundred one million, eight hundred nineteen thousand, one hundred ninety-four".