quintilhão

Etymology
.

Noun

 * 1)  quintillion 1018

Usage notes

 * Portuguese-speaking countries follow the traditional long scale, with the exception of Brazil which adopted the short scale used in the UK and US. The number 1018 is expressed as in African and European Portuguese, but as  in Brazilian Portuguese.
 * The Angolan Government proscribes the use of long scale.
 * In Portugal, the alternative is an informal spelling of the preferred and proscribed.