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Â· just now. Report Abuse. Whilst infinity is the largest theoretical number in the world, the largest number that could be written down would be only 10^10^87 since there are only 10^87 elementary particles in the whole universe.
Do we know exactly how many people there are in the world today? No. There are so many people on this planet that counting them up, exactly, is impossible. However, experts believe there are more than 7 billion people in the world today. This is a fairly reliable estimate. World population in 2014 was over 2 times greater than it was in 1965, 4 times greater than 1910, and 10 times greater than 1730.