infinity is a number that never ends but in modern world the largest number is centillion.
Centillion is a number with 600 0's to it. so it's written like this
10,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000
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There is no largest number under infinity because what ever the highest number is, one can always be added to it, making the new number the highest number.
A googolplex which has a googol zeros (a googol has 100 zeros after it) is a big one, but there is no "highest number", because you can always add one to it. Some people believe infinity is the highest number, but you can always just add one.
or 67777,0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000.carrot to the light
infinity, lets say we have a highest number which is x, x+1 is still a number so Numbers are continued forever.
The highest single number in the decimal system is 9. The highest single number would vary depending on what base you are using, for instance the highest single number in the binary system is 1. The is no 'highest' number. There is a concecept call infinity but that is not really a number but a mathematical tool. There is no such thing. Anything number that you can think of you can always add one more to it. Some people might say infinity is the highest single number, but infinity is a concept not a number. Look at some of the other answers on here related to infinity for more details.