Associated Topics || Dr. Math Home || Search Dr. Math

### Names for Big Numbers

```
Date: 02/11/97 at 13:12:15
From: Craig Kesselheim
Subject: Names for big numbers

Dear Dr. Math -

I've just been working with a team of grade 1 teachers at Bar Harbor,
Maine, and we are wondering about the names for large numbers whose
names end in "illion."  After trillion, how far can you go with
genuine math names (we got to quadrillion, quintillion, sextillion and
septillion, but after that the dictionary and our own knowledge gave
out).

Craig Kesselheim, Science Facilitator
Mt. Desert, ME
```

```
Date: 02/13/97 at 20:03:06
From: Doctor Toby
Subject: Re: Names for big numbers

After septillion, and following the same pattern, come:

octillion
nonillion
decillion
undecillion
dodecillion,
tredecillion
quattuordecillion
quindecillion
sexdecillion
septendecillion
octodecillion
novemdecillion
vigintillion
unvigintillion
dovigintillion
trevigintillion
quattuorvigintillion
quinvigintillion
sexvigintillion
septenvigintillion
octovigintillion
novemvigintillion
trigintillion
untrigintillion
dotrigintillion
tretrigintillion
quattuortrigintillion
quintrigintillion
sextrigintillion
septentrigintillion
octotrigintillion
novemtrigintillion

You may also want to know about one googol, which is 1 followed by
100 zeros, or ten dotrigintillion.

A googolplex is 1 followed by a googol zeros. There are not enough
elementary particles in the known universe to write down a googolplex.
(There are fewer than a trigintillion such particles, but we need to
make ten dotrigintillion one digits.)

But it also depends on whether you are using the U.S. or the British
system.  In the U.S., octillion, nonillion, decillion, undecillion,
dodecillion, tredecillion, quattuordecillion, quindecillion,
sexdecillion, septendecillion, octodecillion, novemdecillion, take
you into the 21st period (10^60).  I found vigintillion as the next
one (10^63) and the largest I could find was centillion (10^303).
I imagine there is something like milletillion (10^3003) as well
(1000 tillion). I looked it up - centillion in the British system is
10^600 (but they have thousand million instead of billion, etc).

By the way, the power of ten is also the number of places (or zeros)

After vigintillion come unvigintillion, dovigintillion, and so on.
After novemvigintillion comes trigintillion, which is followed by
untrigintillion through novemtrigintillion.

One googol = 10^100; this is ten dotrigintillion in America or ten
thousand sexdecillion in Britain.

-Doctor Toby,  The Math Forum
Check out our web site!  http://mathforum.org/dr.math/
```
Associated Topics:
Elementary Large Numbers

Search the Dr. Math Library:

 Find items containing (put spaces between keywords):   Click only once for faster results: [ Choose "whole words" when searching for a word like age.] all keywords, in any order at least one, that exact phrase parts of words whole words

Submit your own question to Dr. Math
Math Forum Home || Math Library || Quick Reference || Math Forum Search