This Calc is too small

This is approx. equal to 2.56⁹⁹*10⁹⁹

Generally we use scientific notation for numbers of this magnitute. 

You do not need a high powered calculator.  Yo can do it yourself.  :)

let   y=256^(1024^3)

1024^3 = 1073741824

\(y=256^{1073741824}\\ log_{10}y=log_{10}256^{1073741824}\\ log_{10}y=1073741824\;log_{10}256\\ log_{10}y\approx 1073741824\;*\;2.408239965\\ log_{10}y\approx 2585827973\\ 10^{log_{10}y}\approx 10^{2585827973}\\ y\approx 10^{2585827973}\\\)

However, here is the answer using wolfram|alpha  :)

this one can, but it will be in scientific notation