A quadrillion is a million, million, million, millions or 10^24 from
quad for four, you see a quadbike does not have two and a half
wheels, just as a tricycle does not have
two wheels (...look up trillion).
A quadrillion
dollars is
a million, million, million, millions of
dollars or $1, 000 000, 000 000, 000 000, 000 000.