That's more of a question for philosophers than mathematicians, but as far as mathematicians are concerned, you can approach it but never get there.
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There is no last number as the numbering system is infinite.
Forever and ever.
In mathematics, numbers are infinite and do not have an endpoint. This concept is known as the "infinity of numbers" or the "infinity of counting." Even though we may not be able to count to infinity in practice, the theoretical concept of numbers continuing indefinitely is a fundamental principle in mathematics. This idea is crucial in fields such as calculus, where infinite series and limits are studied.
In short, it does not. Infinity is only a concept, it has no practical application in the known universe. No phenomenon, natural or artificial, has ever displayed any infinite properties.
Oh honey, infinity is not a number, it's a concept. There's no number that comes before infinity because infinity isn't a point on the number line, it's more like a never-ending idea. So, in short, there's no number before infinity because it's not playing by the rules of regular numbers.