Oh, dude, that's a fun one. So, a number with 68 zeros is called "googol." It's like a googolplex, but not as fancy. It's basically just a really big number that you'll probably never need to use in real life, unless you're counting all the times you've watched "The Office" on Netflix.
0.680 0.680000000000 (add as much as zeros as you want but ONLY TO THE END OF THE NUMBER)You can express it with any number of zeroes after the .68, such as:.68:.680.6800.68000
it is in the millions
octillion
sextillion
Trillion
nonevsextillionocteillion
2*1020 this is called 200quintillion a quintillion is a number with 18 zeros a sextillion is a number with 21 zeros your number has 20 zeros therefore it is not quite a sextillion yet.
ten's of billions
One billion
The number that has 15 zeroes is called quadrillion.
100 quindecillion