This numeric string is likely a database ID or hash used by a specific platform (such as a social media site, educational portal, or internal server) to track the unique asset.
The .mp4 format is a multimedia container, meaning it functions as a "wrapper" that holds various data streams together. 480P_2000K_401618061(1).mp4
Confirms the file uses the MPEG-4 Part 14 container format, the most universal digital video standard. 2. The MP4 Container Standard This numeric string is likely a database ID