There is no number right before infinity. One could say that the number before infinity is "infinity minus one", but you cannot use normal subtraction with infinity. Infinity - 1 is still mathematically defined as infinity, as is Infinity + 1.
Perhaps the question is referring to the largest number with its own name (other than infinity, which, as previously stated, is not technically a number). A googol is often cited as this number. A googol is defined to be a 1 with a hundred zeroes after it.
Alternatively, a googolplex might qualify for the title of largest number with its own name, being a 1 with a googol zeroes after it.
A couple of quick side notes are in order here:
There are not a googolplex atoms in the visible universe. It is an extremely big number.
The search engine company Google named their company after a googol, because of vast amount of information that they process and organize.
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In mathematics, infinity is not a number but a concept representing something endless or unbounded. Therefore, there is no specific number that comes before infinity in the traditional sense of numerical order. Infinity is often considered as a limit or a point beyond which numbers or values cannot go, rather than a specific numerical value.
Negative infinity plus one.
No. Because infinity is not actually a number, but rather an indication of a limitless amount, it is mathematically impossible to count to infinity.
Infinity itself isn't a number in the conventional sence therefore not only is there everything before it there is nothing Ie. If 10,000 were the value of infinity I could add 1 to it and that would become infinity so unless somebody finds the point at which numbers stop ascending there will never be a value before infinity, find ding that point is impossible because as I have said before if you pick a number you can always add 1 to it.
Infinity minus 1-you can't really express the number,in the same way you can't express infinity.