Adam Clarke on Matthew 18:24

Ten thousand talents - Μυριων ταλαντων, a myriad of talents, the highest number known in Greek arithmetical notation. An immense sum, which, if the silver talent be designed, amounts to 4,500,000 sterling; but if the gold talent be meant which is by far the most likely, then the amount is 67,500,000 sterling, a sum equal to the annual revenue of the British empire! See the note on Exo 25:39.