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1 x 10^-6
A 1 followed by 16 zeroes. 10,000,000,000,000,000 "ten quadrillion"
In scientific notation it is 1.57821*10^5 and so it is 10 to the power of 5
The next larger numbers on the short scale (eg in US, based on powers of a thousand plus one) where 1 trillion = (10^3)^(3+1) = 10^12 are: quadrillion = 1 thousand trillion = 10^15 quintillion = 1 million trillion = 10^18 sextillion = 1 billion trillion = 10^21 For the long scale (eg in Europe, based on powers of a million) where 1 trillion = (10^6)^3 = 10^18: trilliard = 1 thousand trillion = 10^21 quadrillion = 1 million trillion = 10^24 quadrilliard = 1 thousand quadrillion 10^27