Septillion
/sepˈtɪljən/
Definition 1 of 1
Pro Tip 1/3US vs UK
Remember 'septillion' differs in the US and the UK; it has 24 zeros in the US and 42 in the UK. 
A US septillion and a UK septillion are not the same number.
Pro Tip 2/3Hyperbole
Use 'septillion' to express something that's huge or exaggerated, often not meant to be taken literally. 
I have a septillion things to do today.
Pro Tip 3/3Abstract Concept
A septillion is used to describe theoretical or cosmic numbers, beyond regular counting or quantities. 
The chances of winning the lottery are one in a septillion.