It is 1 with 80 zeros after it.
Remember 102 =100 wich is 1 with 2 zeros
103 =1000 etc
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The 80th power of two (280) is roughly 1.209 x 1024 (SI prefix yobi, yotta binary).Exactly, it is 1,208,925,819,614,629,174,706,176 (1.21 septillion, short scale).
Eightieth.
10 to the 8th power divided by 10 to the 7th power is 10
10 to the fourth power.
Some prefixes, which you use with any unit, are:Tera (10 to the power 12)Giga (10 to the power 9)Mega (10 to the power 6)Kilo (10 to the power 3)Hekto (10 to the power 2)Deka (10 to the power 1)Deci (10 to the power -1)Centi (10 to the power -2)Milli (10 to the power -3)Micro (10 to the power -6)Nano (10 to the power -9)Pico (10 to the power -12)You can find a more complete list at the Wikipedia, in the article "SI prefixes".