octodecillion

noun

oc·​to·​de·​cil·​lion ˌäk-tō-di-ˈsil-yən 

US : a number equal to 1 followed by 57 zeros see Table of Numbers

also, British : a number equal to 1 followed by 108 zeros see Table of Numbers

Word History

Etymology

Latin octodecim eighteen + English -illion (as in million)

First Known Use

1848, in the meaning defined above