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Anyway! Updated to 3.8 :D
Take Earth for example, its suface area is about 500 billion square kilometers. If you make it into an ecumenopolis, and fill it with people into a population density as much as Manchester, UK for example, which is 4000 people per square kilometer, ranking about 60th in the world, you get 2 trillion population for this ecumenopolis earth.
If the earth ecumenopolis gets a population density as much as the New York City, about 10000 people per sqKm, you get 5 trillion population, and if the density is like Manila, 43k/sqKm, you get 20 trillion.