Octillion !
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27 zeros = 1 octillion in UK as well as US. The UK does not have a different system and has not had one for at least 20 years.
A number with 328 zeros can be represented as (10^{328}). This is a 1 followed by 328 zeros, which is a very large number. In standard form, it would be written as 100000...0000 (with 328 zeros following the 1).
The number that is 1 followed by 17 zeros is called ten quadrillion, represented as 10,000,000,000,000,000. In scientific notation, it is expressed as (1 \times 10^{17}).
googolplex
It would be represented in scientific notation as 1.0*10^47