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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.
Mumbai, India is the world's largest city with population of 12,778,721. Hulunbuir, China is the world's largest city by an area of 263,953 Square Km. Mumbai, India is the world's largest city with population of 12,778,721. Hulunbuir, China is the world's largest city by an area of 263,953 Square Km. Source(s): http://www.mongabay.com/cities_pop_01.htm.