There are 1,826 billionaires in the world with a total net worth of $7.05 trillion, representing only 0.000025% of the world's population but possessing wealth equal to 65% of the poorest adults. The top 20 richest billionaires have a combined net worth of $900 billion, more than the combined population of Brazil and Pakistan. Many of the top billionaires give a significant portion of their wealth to philanthropic causes in areas like health, education, and poverty alleviation.