The largest number in the universe
Googol. It is a large number, unimaginably large. It is easy to write in exponential format: 10100, an extremely compact method, to easily represent the largest numbers (and also the smallest numbers). With the smallest of effort, you can also present it in the full format: a “one” followed by one hundred “zeros”. However, in its exponential format, it can be easily read; in the full format, you may loose count of the amount of times you need to use the term, “billion” in “ten billion of billions