I believe the answer is 1 Billion (1,000,000,000)
1 Quintillion = 1 Billion x 1 Billion
1,000,000,000,000,000,000 = 1,000,000,000 x 1,000,000,000
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Oh, dude, a billion times a trillion is like a quadrillion. It's like winning the lottery and then realizing you won the lottery again, but on steroids. So yeah, it's a pretty big number, but hey, who's counting, right?
Billion has 9, Trillion has 12, Quadrillion has 15,Quintillion has 18 .
1 million to the 5th power million, billion, trillion, quadrillion, quintillion
10^18 or 1,000,000,000,000,000,000which is 1 quintillion.
100 *EDIT* to the idiot who said 100, you would have 100 billion. to put it in ways to understand, if you had 999 billion, just add one more billion and you have quadrillion, and you would need 1 quadrillion past 999 quadrillion to reach quintillion. so... many many many billions