The human brain, it has been said, is the most complexly organised structure in the universe and to appreciate this you just have to look at some numbers. The brain is made up of one hundred billion nerve cells or "neurons" which is the basic structural and functional units of the nervous system. Each neuron makes something like a thousand to ten thousand contacts with other neurons and these points of contact are called synapses where exchange of information occurs. And based on this information, someone has calculated that the number of possible permutations and combinations of brain activity, in other words the numbers of brain states, exceeds the number of elementary particles in the known universe.

Lecture 1 - Phantoms in the Brain
BBC R4 - The Emerging Mind ( Vilyanur Ramachandran -Reith 2003)

Got Calculator? Here are the bunch of interesting numbers So the total wealth of the world is about $70 trillion of dollars. (from a different source is about 100 trillion)