I have an .xlsm spreadsheet with a column called "Serial Number" which is set as Text. However, when a long number is entered that has no alpha characters in it, it is reduced to a number with an exponent. I don't have control over the data entry in this sheet so I can't force the data entry persons (some of whom may have only a rudimentary understanding of what they are doing) to lead with a apostrophe. Is there any way to force this to remain text and keep all the digits?