As part of the creation of an IBAN number generator, I need to divide the 26-digit number by the number 97 to find out the check digits in the IBAN number.

After about an hour of searching, I found out that Google Sheets cannot calculate with such large numbers:
Google Sheets not processing very large numbers

But how can I bypass this limitation in Google Sheets? I am trying to find the first 6 digits after the decimal point after dividing a 26 digit number by 97.

I have the same problem in LibreOffice Calc.

I am not looking for a way to verify the validity of the entire IBAN number. I am looking for a way to create check digits when generating an IBAN.