Numbers of ZEROs

Number of zeros U.S. & scientific community Other countries 3 thousand thousand

6

million

million

9	billion	1000 million (1 milliard)
12	trillion	billion
15	quadrillion	1000 billion
18	quintillion	trillion
21	sextillion	1000 trillion
24	septillion	quadrillion
27	octillion	1000 quadrillion
30	nonillion	quintillion
33	decillion	1000 quintillion
36	undecillion	sextillion
39	duodecillion	1000 sextillion
42	tredecillion	septillion
45	quattuordecillion	1000 septillion
48	quindecillion	octillion
51	sexdecillion	1000 octillion
54	septendecillion	nonillion
57	octodecillion	1000 nonillion
60	novemdecillion	decillion
63	vigintillion	1000 decillion
66-120		undecillion - vigintillion
303	centillion
600		centillion

 

Addendum:

 

There are other big numbers with names. A zillion has come to mean an arbitrary or unknown large number. A googol is 10^100. A googolplex is 10^googol (10^10^10^2) . This number is too large to write here without exponents. Skewes' number (gesundheit) is 10^10^10^34 was used as an upper bound in a mathematical proof. Recently 10^10^10^10^ 10^7 was used in a proof.

 

The googolplex has given rise to the n-plex notation: n-plex is 10^n. n-minex is 10^-n. Donald Knuth invented arrow notation, where m^n (^ is an up arrow) is the regular m^n. m^^n is m^m^m^m...^m, with n up arrows. m^^^n is m^^m^^m...^^ m, with n ^^s. According to The Book of Numbers by J.H.Conway and R.K.Guy, chained arrow notation is the following enhancement: a^^^^^b is written as a>b>5, where > is a right arrow.