A sextillion.
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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 English1045 quattuordecillion septilliard
A pentillion was the name proposed for what is not known as a quadrillion = 10^15. This was necessitated by the confusion between the US and European use of billion (thousand million or million million) and higher numbers. New names, based on Greek roots, were proposed. In many countries the European names have now been dropped in favour of the US names. So the next term would have been a hextillion.
The correct word form is: thirty sextillion, seven hundred quintillion
*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 thousand thousand million has 12 zeroes.