What is the biggest known star in the universe?

There are billions and trillions of stars in our universe. To put it into perspective, there are around 200 sextillion stars in the universe. 
Within this expansive number are stars of all shapes and sizes. This includes the smallest star ever recorded, "EBLM J0555-57Ab," which is about the size of Saturn. But what about the biggest star in the universe?
You're going to need more than just a telescope to get a glimpse of this hypergiant star. Here is what you need to know about the biggest star in the universe and how it compares to our Sun. 
The largest known star in the universe is UY Scuti. It has an estimated radius of 1.188 billion kilometers. If UY Scuti were the center of our solar system, its photosphere, or outer shell, would reach just past the orbit of Jupiter. 
What is the biggest known star in the universe? Its radius is 1700 times larger than the Sun's.