This will be the closest for you to determine:
https://bitinfocharts.com/top-100-richest-bitcoin-addresses.html
The number is between 1 and the Number of Addresses holding coins. Several addresses can be owned by one user so its practically impossible to determine how much a given person actually owns. Unless you know all their addresses.
What this table shows is how poorly distributed bitcoin still is. To be expected given the Pareto principle.