There are 40 quintillion black holes in the observable Universe. More or less.

How many black holes are there?

I don't mean near the Sun, or even in the galaxy. I mean, how many black holes are there in the entire observable Universe?

Turns out about 40 billion billion of them.

For those who like numbers, that's 40,000,000,000,000,000,000. In exponential notation that's 4 x1019.

In English, that's holy crap that's a lotta black holes.