Officially the estimated national debt of the United States for 2009 is: 12,867,500,000,000 However this figured does not include some long term obligations that could double the cost.
In perspective if you made one dollar every second for the next 408,025 years, you would be able to pay it off (at the 12 trillion figure).
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The US National Debt is nearly $16,963,703,000, or 16.9 trillion dollars.
You should round to two decimal places unless the number is large - like the US national debt, for example.
The amount of the national debt in expanded notationis? something to figure out yourself
the mass of the sun,the number of stars in the universe,the number of neurons in an average human brain,the US national debt,the number of things that a person could do to help other people.
To enumerate things of which there are very many. Depending on what you consider to be large: the world population (around 7 billion), the US national debt (USD 17.5 trillion), number of atoms (or molecules) in 1 mole of a substance (6.022*10^23 or 602.2 sextillion), number of stars, and so on.