In the world there are more than 200 countries, but it is amazing how there are countries with such people and others with so little that there is more common in a small town in the whole country of those, but it really is to see half world's population is distributed in only 6 countries, of course these are the 6 countries the world, then you have this illustrative graphics that shows the distribution of half the world's population.
These 6 countries as you saw in the graphics are China first, India second, U.S. third and far from the 2 first places, Indonesia fourth, Brazil, Pakistan fifth and sixth.
All other population, the other half live in 206 different countries.