In calc, select any cell Type a number with more than 15 figures ex: 123456789123456789 Although cell format is number/standard, display is: 1,23456789123457E+017 Attempts to switch back to number/-1234 display shows that the last figures are lost in the process and replaced by 0s: 123456789123457000 Consequence is data loss in files including large numbers, like serial numbers for example (workaround is to convert to text but data is lost anyway in the process).
it seems you're using an old version of LibreOffice. Could you please try to reproduce it with the latest version of LibreOffice from https://www.libreoffice.org/download/libreoffice-fresh/ ? I have set the bug's status to 'NEEDINFO'. Please change it back to 'UNCONFIRMED' if the bug is still present in the latest version.
Such number is beyond of the limits precision for numbers. https://bugs.documentfoundation.org/show_bug.cgi?id=67026#c1 Not a bug IMO.
*** Bug 153339 has been marked as a duplicate of this bug. ***