There is no number name consistently used for 10^189. It is larger than a googol (10^100) but smaller than a centillion (10^303) on the US short scale.
There is a suggested name of "novemquinquagintillion" for the number 10^180, so 10^189 could be expressed as "one billion novemquinquagintillion."
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1 followed by 18 zeros is a quintillion.
A trillion is 1 followed by 12 zeros, a sextillion 1 followed by 21 zeros
That depends how many zeros follow the 1.
a googolplex is 1 followed by a google zeros a google is 1 followed by a hundred zeros the corporation google headquarters are known as the Googleplex
A googleplex is considered to be 1 followed by 100 zeros.