500,000,000,000,000,000,000,000 = 5 x 1023 = 500 sextillion.
This is just shy of the number of molecules in one mole of any substance (6.022×1023 = Avogadro's number).
This number also happens to be in the ballpark of the diameter, in miles, of the observable universe, based on latest astronomic research (90 billion light years, multiplied by 6 trillion miles per year).
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500,000,000,000,000,000,000 is a numerical representation of five hundred quintillion in standard form. This number is composed of 20 digits, with each digit representing a specific place value within the number. In scientific notation, this number would be written as 5 x 10^20, indicating that the number is multiplied by 10 raised to the power of 20.
Oh, dude, that's a big number! Like, that number is 5 followed by 23 zeros. It's called 500 sextillion. So, if you ever need to count that high, you're covered!