Scientific notation, can't believe you made it out of secondary school without knowing that
e.g. for 3.7 x 10^6, 10 to the power 6 is a million, so would be 3.7 million
That was why I asked it for an answer "in tonnes", so it gave 740 million tonnes as a fairly readable number, instead of 7.4 x 10^11 kilos.
Well, 5^n by itself doesn't make sense, what is n? but 5^2 or 5^3 etc it will handle.