It depends what you mean when you say "plus". If you mean simple addition,
the answer is 1,000,000,001,000,000,000,000,000,000
(spoken: "1 octillion, 1 pentillion").
If you mean what happens when you combine the number of place-values in one-octillion, with the place-values in one-quintillion (i.e., pentillion)? ...which technically is multiplication, not "plus"-ing... then you get:
Scientific Notation, American English, British English
1045 quattuordecillion septilliard
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*Centillion* Is not a measurment but is a number,1 million is 1000,000 Billion-1,000,000,000 Trillion-1,000,000,000,000 Quadrillion-1,000,000,000,000,000 Pentillion-1,000,000,000,000,000,000 Hexillion-1,000,000,000,000,000,000,000 Cept/Heptillion-1,000,000,000,000,000,000,000,000 Octillion-1,000,000,000,000,000,000,000,000,000 Nonillion-1,000,000,000,000,000,000,000,000,000,000 Centillion-1,000,000,000,000,000,000,000,000,000,000,000
A sextillion.
One octillion.
After octillion is nontillion or octillion and one. Nontillion has 30 zeros. Looks like 1,000,000,000,000,000,000,000,000,000,000
One octillion = 1027.