sexdecillion
noun
sex·de·cil·lion ˌseks-di-ˈsil-yən 
often attributive
US : a number equal to 1 followed by 51 zeros see Table of Numbers
also, British : a number equal to 1 followed by 96 zeros see Table of Numbers
Example Sentences
Recent Examples on the Web Eventually, this creature was proved to live — or, technically, to act — in 196,883 dimensions, and to possess 808 sexdecillion or so symmetries. 
Siobhan Roberts, New York Times, 3 Mar. 2020
Siobhan Roberts, New York Times, 3 Mar. 2020 Word History
Etymology
Latin sedecim, sexdecim sixteen (from sex six + decem ten) + English -illion (as in million) — more at ten
First Known Use
1848, in the meaning defined above