Infinity is a concept, not a number.
Even if it were considered such, infinity plus one is also infinity, and so infinity minus one is still infinity.
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I suppose you mean, the biggest finite number. There is none; you can always add one more, to get an even bigger number. Nor is there a biggest infinite number, for that matter. If you raise two to an infinite power, you get a bigger infinity.
Infinity is the highest number of all. Technically, some people say that infinity is too much that infinity is 0.
Infinity.
There is no answer for this, there is an infinity possibilities.
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.