50 is a positive integer between 49 and 51. Its ordinal form is written "fiftieth" or 50th.
In googology Edit
In Greek-based number-naming systems, 50 is associated with prefix "pentaconta-", and with prefix "quinquaginti-" in Latin systems.
It is also the prize for correctly answering the first question in the German game show Wer wird Millionär? in euros.