A unit prefix is a specifier or mnemonic that is prepended to units of measurement to indicate multiples or fractions of the units.
1059 (1E+59), there are 100,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000 Planck Lengths in a Yottameter.
A Yottameter is 10/24 which makes it larger than the Petameter that is 10 to the 15th power.
petameter
Its About 1000000000000000000000000 Metres (1 Septrillion)(24 Zeros)
megameter,gigameter,terameter,petameter,exameter,zettameter,yottameter.....
1 septillion, OR 1,000,000,000,000,000,000,000,000 (24 zeros)
2 yottameters
A petametRE is 1x1015 metres. A yottametRE is 1x1024 metres. So a yottametre is a lot longer.
In the SI (metric) system, there are 7 prefixes above kilo: mega, giga, tera, peta, exa, zetta, yotta. Therefore, the yottameter is the longest unit of metric measurement, equaling 1 septillion (1x1024) meters.
A yoctillion is a numerical value equal to 10^24, or 1 followed by 24 zeros. It is part of the short scale numbering system, which is commonly used in the United States and most English-speaking countries. In scientific notation, it is often represented as 1 yottameter or 1 yottagram, depending on the context. The term is derived from the SI prefix "yocto," which signifies a factor of one septillionth (10^-24).
The related link lists prefixes which can be used with metric base units. The largest of these is yotta- (abbreviated Y-) which means a multiplier of 10^24. So 1 yottameter is 10^24 meters, for example. For comparison a light-year (the distance light will travel in 1 year) is about 9.47 x 10^15 meters. So there are over 100 million light years in 1 yottameter, for comparison.
1000km = 1 Megameter (Mm) a thousand km 1,000,000km = 1 Gigameter (Gm) a million km 1,000,000,000km = 1 Terameter (Tm) a billion km and it goes on further Petameter, Exameter, Zettameter, Yottameter.