Largest Number for a variable

I made a calculator which somehow could display values over one trillion. So I need to know what is the maximum possible value for a variable as I am making a second one (port), but it needs a isNaN, so I need to find the max value or something like that. Any help would be appreciated.

isNaN = (Not-a-Number)

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More from the horse's mouth ...

I personally consider myself an instances of HomoSapiens :slight_smile: