Long numerical strings are frequently used by surveillance systems or dashcams to timestamp or serialize video clips.
If the file won't open in your default player, the VLC Media Player is a reliable, free tool that can handle almost any MP4 codec. 770054949544_3(1).mp4
Right-click the file, select Properties , and go to the Details tab to see the date created, frame width, and length. On Mac: Right-click the file and select Get Info . Long numerical strings are frequently used by surveillance