This format is used by the messaging platform to name and organize documents, media, or cached files internally. Because these strings are unique to specific files within Telegram's database, the number itself does not carry a public "meaning" like a phone number or a serial code. If you are seeing this text, it is likely because:
The sequence is a specific file identifier typically generated by Telegram . 5_6145434868646937380
: You found this string while browsing your device's Telegram storage or cache folders. This format is used by the messaging platform
: You have downloaded or shared a document that retained its internal database name. 5_6145434868646937380
: The string appeared in a technical log or system report related to an app's performance.