Many web servers (like cPanel or WordPress) name backup files using the Unix timestamp of when they were created.
Avoid opening the file until it has been scanned. 1640122781-2.zip
Did this come from an old email attachment or a cloud storage folder (Dropbox/Drive)? If it was a sudden pop-up download, delete it immediately. Many web servers (like cPanel or WordPress) name
To help me give you more specific details, could you tell me: 1640122781-2.zip
If you are on a Mac or PC, right-click the file and select Properties (Windows) or Get Info (Mac) to see the "Where from" URL or the "Created" date to verify its source.
Services like Google Takeout, Facebook, or banking portals often generate zip files with numeric strings.