As per Google search these are the top 3 richest person of this world.
1.Jeff Bezos $108.9 billion
2.Bill Gates $91.9 billion
3.Warren Buffett $90.1 billion
But these maybe wrong since in this world there are lot of blackmoney is available which were not recorded by any governments.
In my opinion the politicians from the third world countries can be in the richest persons because they were stealing all their country's taxes.
Just do a simple calculation of the hidden 1million from Satoshi you will know that is around $12billion at present price. But no one has ever calculated that. It shows that there is a lot of unrecorded wealth and we may not know the richest person in the world.