Officially approved by the SI, no. Actually if you want such a large number, you can just as well use the base unit, and scientific notation. For example, instead of "3.2 Petahertz", you might just as well talk about 3.2 x 1015 hertz.
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A metric ton, also called a tonne, is bigger than a kilogram. One metric ton is equal to 1,000 kilograms.
In the metric system, a decimeter is bigger than a centimeter. There are 10 decimeters in a meter, and each decimeter is equivalent to 10 centimeters.
They avoid having to use huge numbers, or worse, extended decimals, to indicate quantities. How would you like to have an elephant weighed in at 5,500,000 grams or a human hair with a diameter of 0.000 1 meters?There are more prefixes than get used, but this is OK; people can use the ones that best "fit" their subjects. For example, the metric for land is the are, which is 10 meters x 10 meters or 100 square meters. Nobody uses it; they prefer the unit closest to the acre, which is the hectare, or 100 are (10,000 square meters).Choice of prefix can be idiosyncratic; what one person calls 100 millimeters, another could call 10 centimeters, or even 1 decimeter. Personally, I like to remember the sizes of countries in gigare, or billion are, a unit much more convenient (and therefore easier to recall) that 100,000 square kilometers, which is the way geography books give them. Smaller countries can be in megare (million are) and the whole of Planet Earth is 5.1 terare (trillion are).
Kilograms is a WEIGHT. The word you apparently wanted here is kilometres,which is a metric LENGTH. A kilometre is about 0.6 of a mile
For units larger or smaller than the base units, you can use prefixes such as kilo (x 1000), Mega (x 1 million), milli (x 0.001), micro (x 0.000 001), etc.; for a complete list, search the Wikipedia for "SI prefixes".