1 (ichi)
2 (ni)
3 (san)
4 (shi or yon)
5 (go)
6 (roku)
7 (hichi or nana)
8 (hachi)
9 (ku or kyu)
10 (ju)
11 (ju-ichi)
12 (ju-ni)
13 (ju-san)
14 (ju-shi or ju-yon)
15 (ju-go)
16 (ju-roku)
17 (ju-hichi or ju-nana)
18 (ju-hachi)
19 (ju-ku or ju-kyu)
20 (ni-ju)
21 (ni-ju-ichi)
22 (ni-ju-ni)
23 (ni-ju-san)
24 (ni-ju-shi or ni-ju-yon)
25 (ni-ju-go)
26 (ni-ju-roku)
27 (ni-ju-hichi or ni-ju-nana)
28 (ni-ju-hachi)
29 (ni-ju-ku or ni-ju-kyu)
30 (san-ju)
31 (san-ju-ichi)
*The same pattern applies up to 99*
99 (kyu-ju-kyu)
100 (hyaku)
101 (hyaku-ichi)
*The same pattern applies up to 199*
200 (ni-hyaku)
*
300 (san-byaku) *irregular pronunciation*
*
400 (yon-hyaku)
*
500 (go-hyaku)
*
600 (roppyaku) *irregular pronunciation*
*
700 (nana-hyaku)
*
800 (happyaku) *irregular pronunciation*
*
900 (kyu-hyaku)
*
1,000 (sen)
*
2,000 (ni-sen)
*
3,000 (san-zen) *irregular pronunciation*
*
4,000 (yon-sen)
*
5,000 (go-sen)
*
6,000 (roku-sen)
*
7,000 (nana-sen)
*
8,000 (hassen) *irregular pronunciation*
*
9,000 (kyu-sen)
*
10,000 (ichi-man)
*
20,000 (ni-man)
*Let's skip to 100,000*
100,000 (ju-man)
*
1,000,000 (hyaku-man)
*
10,000,000 (sen-man)
*
100,000,000 (ichi-oku)
*
1,000,000,000 (ju-oku)
*
10,000,000,000 (hyaku-oku)
*
100,000,000,000 (sen-oku)
*
1000,000,000,000 (itcho) *irregular pronunciation*
*
2,000,000,000,000 (ni-cho)
*the same pattern applies up to 8,000,000,000,000*
8,000,000,000,000 (hatcho) *irregular pronunciation*
*
9,000,000,000,000 (kyu-cho)
*
10,000,000,000,000 (jutcho) *irregular pronunciation*
*
20,000,000,000,000 (ni-jutcho) *irregular pronunciation*
*
30,000,000,000,000 (san-jutcho) *irregular pronunciation*
*remain irregular up to 100,000,000,000,000*
*
100,000,000,000,000 (hyaku-cho)
*
1,000,000,000,000,000 (sen-cho)
So for example,
9,876,543,219,876,543 (9 quadrillion 876 trillion 543 billion 219 million 876 thousand 543)
is
kyu sen happyaku nana ju roku cho go sen yon hyaku san ju ni oku sen kyu hyaku hachi ju nana man roku sen go hyaku yon ju san
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