If you doubled a penny every day for 64 days how much money would that be?

If on the first day you have 1 penny, on the 64th day, you would have 263 pennies, or about

$ 9.22 x 1016 dollars. On the US short scale, this is more than 92 quadrillion dollars (92,000 trillion dollars), which is more money than there is in the entire world. The total GDP of all the countries on Earth is only about 80 to 90 trillion dollars, about 1000 times less than your hoard of pennies.