Who is truly the richest man on earth?

The world has its own way of judging riches and they tend to accord as rich those who have a lot of material wealth.
In reality, in the eyes of God, true riches is not judged as such. In fact no one is rich except he is rich in God.

The richest man on earth is the man who has the most of God. So, the more of God that a person possesses, the more rich he truly is.
The amount of income a person has is not true riches as these things are temporal and do not guarantee life. It is only when a person has God, dwelling in him, can he be truly rich. You can't say that you are safe and secure when your wealth cannot guarantee a lasting future.

There are stories of people who make millions of dollars yearly and have hundreds of billion dollar assets but those are not true riches since they have a short time frame. Why not invest in riches that have an eternal lifespan ? - Riches that never end.

If you are rich materially, don't consider those as true wealth because there is something greater than that. You can do better if you invest in the riches that come from the kingdom of heaven.