Is 100000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000 the largest number in the world?

Answer 1

There is no "largest number in the world". If you add 1 to the number you wrote, you get a larger number. Omitting some zeroes: if your "largest number" is 1,000,000, add 1 to get 1,000,001. This will obviously be larger than the original number.

People may think infinity is the largest number, but relativaly speaking infinity is not a number, therefor infinity goes on and on. Think of it as f(x)=x+1 if you substitute x for any number you will get a larger number that what x was. Googleplex which is 10^100 is too large to write on paper and is also larger than the universe.

To sum up, there is no largest number. Nothing is faster than the speed of light. E=Mc2. Engery=mass times the speed of light squared.