Lots of them.
A gabillion, possibly a variant of gazzillion, means a number so big that it is not possible to comprehend it. People who are comfortable with large numbers are unlikely to use the word.
I googled it and got 36,100 hits, so a lot of people are using it. If becomes popular enough, it will eventually be in the dictionaries.
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28810 sets of zeros that is equal to 86430 zeros in the number gazillion that is 10^86430
31 total zeros 10,000,000,000,000,000,000,000,000,000,000
The same as the number of zeros in 10000, that is, 4.
24
None. There is no such number