The highest number in maths, although it is not really a number but an idea, is infinity. However, accorcing to the Guinness Book of Records the largest named number is a googolplex. A Googol (Not Google!) is 10 raised to the power of 100, or 1 with 100 zeros after it. A googolplex is 10 raised to the power of a Googol. This number is as near to infinity as can be practically imagined.
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