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.