How to write 20-digits numbers without Excel automatically messing them up?

Originally Posted by Richard Buttrey

Can't comment on its efficiency or accuracy but there's an add in here http://precisioncalc.com/xlprecision.html which might be of interest.

Thanks but no, I don’t think refining the precision of my experiments is worth buying another software. Going up to 15-digits numbers already gave me a pretty good precision.

Originally Posted by Richard Buttrey

Just as a matter of interest what are the very big numbers you're handling and what sort of arithmetic do you want to perform with them?

Superior highly composite numbers: http://en.wikipedia.org/wiki/Superio...mposite_number

Originally Posted by Terminatrix

As for what I’m doing precisely with these numbers, it’s a secret that goes far beyond your imagination.

...and purely as a matter of interest again, why do you think such a rude remark is called for?

Are you always so superior to those who are genuinely trying to help or did you just get out of bed the wrong side? You might like to think on rule 6b if you continue to seek help in this forum. Others might have already given you an infraction. I'll wait to see if you care to mollify your comment.