Vocabulary consisting only from characters you are able to read
百京
hjakukjou
kvadrilionmix
億
oku
(num) 100,000,000, hundred millionjlpt4
一兆
iččou
1,000,000,000,000, one trillion, one billion (obs. British)mix
十億
džuuoku
1,000,000,000, billion (American), (obs) milliard (British)mix