centillionth

cen·til·lion

C0199450 (sĕn-tĭl′yən)n.1. The cardinal number equal to 10303.2. Chiefly British The cardinal number equal to 10600.
[Latin centum, hundred; see dekm̥ in Indo-European roots + (m)illion.]
cen·til′lion adj.cen·til′lionth adj.adv. & n.

centillionth

(sɛnˈtɪljənθ) n(in Britain and Germany) a number equal to 10–600(in the US, Canada, and France) a number equal to 10–303