I've read there would be 1,461,501,637,330,902,918,203,684,832,716,283,019,655,932,542,976 combinations. But with the exploding use of new bitcoin address for every transactions and with the ease of creating address, some automated bots can create unlimited number of addresses. So what if we ran out of bitcoin address. Is it even possible?
I think this thread has been answered before. there is no need to worry about the number of addresses. Go back to school and take a calculus course. They will teach about imaginary num,bers never reaching the x or y axis on a graph. if that's too difficult to explain, go back to school and upgrade your Math.
At 1billion (10^9) addresses per sec
~1,461,501,637,330,902,918,203,684,832,716,283,019,655 sec before we run out or ~4.63 * 10^31 years