Striictly speaking, ten quadrillion. But you may be thinking of quintillion.
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quadrillions
The millions, then the Ten Millions, then the Hundred Millions, then the Billions, the Ten Billions, the Hundred Billions, the Trillions, the Ten Trillions, the Hundred trillions, the Quadrillions, the Ten Quadrillions, the Hundred Quadrillions, the Quintillions and so on.
It goes either: upward: ones, tens, hundreds, thousands, ten-thousands, hundred-thousands, millions, ten-millions, hundred-millions, billions, ten-billions, hundred-billions, trillions, ten-trillions, hundred-trillions, quadrillions, ten-quadrillions, hundred-quadrillions, etc. downward: ones, tenths, hundredths, thousandths, etc. like upwards but starting at tenths and decimal places. Mainly it will just be a "ths" instead of a "s"
The place value after tenths is hundredths.
quadrillion, quintillion, sextillion, septillion, octillion, nonillion and decillion