Here is a nice video that explains what is USB Type C that is being increasingly seen in most of the new devices these days
Each YouTube Video has an ID, that is a unique, random and made of 11 characters
He explains different numbering systems Base 10, Base 2, Base 16 and about the one which YouTube uses, Base 64.
73,786,976,294,838,206,464 – Seventy Three Quintillion, Seven Hindered Eighty Six Quadrillion, Nine Hundred Seventy Six Trillion, Two Hundred Ninety Four Billion, Eight Hundred Thirty Eight Million, Two Hundred Six Thousand, Four Hundred Sixty Four
With this number can YouTube run out of IDs for Videos, Tom Scott says, Technically Yes, Practically No.