User:Exacube

'exa' is a metric prefix that represents a rather larger number (One quintillion -- 10 to the power of 18). 'cube' is the mathematical term for a number to the power of 3. Therefore, exacube is nothing but a very large (and long) number -- 10 to the power of 54:

1,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000