There are two number format settings in Confluence:

• Long number format. For example: ###############
• Decimal number format. For example: ###############.##########

Confluence uses the guidelines in this Java document from Oracle: Class NumberFormat.

To change the number formats in Confluence:

1. 

2. Choose General Configuration in the left-hand panel.
3. Choose Edit.
4. Update the Long Number Format and Decimal Number Format to suit your requirements.
5. Choose Save.