Numbers Galore

This site is a great resource for school children to translate numbers from digits 0-999,999,999,999,999 to actual letters such as this:  zero - nine hundred and ninety-nine trillions and nine hundred and ninety-nine billions and nine hundred and ninety-nine millions and nine hundred and ninety-nine thousand and nine hundred and ninety-nine).

Sorry, it does not count to quadrillion.