[yuubi]

Also, man doesn't work the same way as the lower powers of 10.

The lower powers 10–1000 take a prefix of 2–9 to multiply them, and omitting the prefix means one.

1 ichi

2 ni

10 juu (not ichi juu)

20 ni juu, literally two ten

100 hyaku

200 ni hyaku

The powers of 10000 seem to take an obligatory prefix 1–9999, formed the usual way (I've never heard just "man" for 10k, always "ichi man", and 12340000 would be literally translated to "thousand two hundred three ten four ten-thousand", while none of the smaller powers seem to ever take a prefix > 9.)

The above is based on not living in Japan, though, so the sample of numbers I've seen might well be missing some things that occur in actual native speech by someone not teaching a first-year class.

[badminton1]

Yes. Every "myriad" (10^4) they have another word. Meaning they have one for 10^4, 10^8, 10^12, 10^16 and so on... http://www.sf.airnet.ne.jp/~ts/japanese/largenumber.html

Largest one I've seen is 10^68.