Below is a blog post template you can use to cover this "mystery" file, focusing on how to identify, secure, and handle such numeric-heavy video files.
Right-click the file and go to Properties > Details . Often, the "Date Taken" will tell you exactly when the video was filmed, even if the name is gibberish. 599977081141 - 4984938569525.mp4
If you have dozens of these files, tools like Adobe Bridge or Bulk Rename Utility can help you rename them based on their creation date automatically. Below is a blog post template you can