Question: what is the biggest number in the world other than one trillion because to make number bigger you would just add on one but how could you???

Lewis Wright answered on 7 Mar 2017:

The search engine Google gets its name from the number ‘googol’, which is a 1 with 100 zeros. This can be written as 1 x 10^100.

A googolplex is a 1 with a googol zeros. This can be written as 1 x 10^(10^100).

A googolplexian is a 1 with a googolplex zeros. This can be written as 1 x 10^(10^(10^100)). A googolplexian is the largest number with a name.

Its true that you could take a googolplexian and add 1 to it, and then one to that, and then one to that – the end is when you reach infinity (but by definition, infinity doesn;t have an end!)