Americans, and other peoples in the West, use Hindu-Arabic numeral system, plus a great many other developments in mathematics even for everyday arithmetic! Please see the link.
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The Chinese number systems derived from the number systems that were in use in the Shang Dynasty.
The Indian sub-continent where the zero symbol came from
This will be some number times 10^18, which depending on what system you use (American or European) it will be either quintillion (American) or trillion (European).
The Place Value System Originated From The Indus Valley civilization I Think.
The number one octillion has just a single digit 1. In the short-scale, American system, this is followed by 27 zeroes, and in the long-scale, British system, this is followed by 48 zeroes.