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.
googolplex
It would be represented in scientific notation as 1.0*10^47
10100. If you write it out, you have a 1, followed by 100 zeroes.
Quadrillion definition1. a cardinal number represented in the U.S. by 1 followed by 15 zeros,and in Great Britain by 1 followed by 24 zeros.