Nitro, Nitroso, Nitrate, and Nitrite Compounds, Organic. Reactive groups are categories of chemicals that typically react in similar ways because they are similar in their chemical structure. Each substance with a chemical datasheet has been assigned to one or more reactive groups, and CAMEO Chemicals uses the reactive group assignments to make its reactivity predictions.
The largest  number that has a commonly-known specific name is a googolplex,  which is a 1 followed by a googol zeros, where googol is 10100 (a 1  followed by 100 zeros).
The largest known Prime Number. On January 7th, 2016, Dr. Curtis Cooper, a professor at the University of Central Missouri, discovered the 49th known Mersenne prime, 274,207,281-1, a 22,338,618 digit number. This find shatters the previous record prime number 257,885,161-1 of 17,425,170 digits.