There wasn't just one Apollo flight, there were a series of them!

The Apollo program had 17 missions, numbered Apollo 1 through Apollo 17.

* Apollo 1 was an uncrewed test flight.

* Apollo 7 was the first crewed flight.

* Apollo 11 was the famous mission that landed the first humans on the moon.

So, depending on which specific Apollo flight you're interested in, the number could be anything from 1 to 17!