### What are the largest economies sorted by GDP?

1. United States $13.8 trillion 2. Japan $4.38 trillion 3. Germany $3.32 trillion 4. China $3.28 trillion 5. United Kingdom $2.8 trillion 6. France $2.59 trillion 7. Italy $2.1 trillion 8. Spain $1.439 trillion 9. Canada $1.436 trillion 10. Brazil $1.31 trillion (2007 International Monetary Fund statistics based on US Dollars)

### Is there a name for the number one trillion trillion (i.e. 1 trillion x 1 trillion)?

Yes, but it becomes confusing - even more so by the fact that words such as "trillion" have two different meanings, and you often have to guess which meaning is intended. It's better to use scientific notation for such large numbers. For the record, in English-speaking countries a trillion trillion would be called a septillion. For more information, check the Wikipedia article on "Long and short scales".

### How much is one trillion?

Trillion is a contraction of tri-million. The "tri-" prefix implies 3; how that is used as a power depends where you are: On the long scale, based on powers of a million, as used in Europe: 1 trillion = (1 million)³ = (10⁶)³ = 10¹⁸ = 1,000,000,000,000,000,000 On the short scale, based on powers of a thousand plus one, as used in USA: 1 trillion = (1 thousand)³⁺¹ = (10³)⁴ = 10¹² = 1,000,000,000,000

### What is a trillion?

The number name "trillion" is used by two competing numbering systems. On the "short scale" used in the US and officially now by the UK, the number name "trillion" means one thousand billion, or 1 x 1012, or 1,000,000,000,000. On the "long scale of Europe, Latin America, and other areas of the world, a "trillion" is one million billion, which is one million million million. Under this scale a trillion is 1 x 1018, a…