How much is 9999999999999999999999999999999999999999999999999999999999999 99999999999999999999999999999999999999999999999999999999999999999999999999999?

The sum of the two numbers you provided is ( 100000000000000000000000000000000000000000000000000000000000000000000000000000000000000000 ). This is achieved by aligning the numbers correctly and adding them in a standard arithmetic manner, resulting in a single number with many zeros.