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In the United States, undecillion is the name of the number 1,000,000,000,000,000,000,000,000,000,000,000,000, or 10³⁶.��

In Great Britain, an undecillion is the name of a number represented by 1 followed by 66 zeroes, or 10⁶⁶.

Because 1 undecillion is such a large number, you won’t often see it used. One of the most notable uses of undecillion is in the study of atoms. The ratio of electric force to gravitational force between two protons is roughly equal to one undecillion. Another notable use is in computing and internet infrastructure discussions. Under internet protocol version 6 (IPv6), the maximum number of IP addresses the global protocol can contain is around 340 undecillion.

You’re more likely to see undecillion used figuratively to mean a large unknown amount, as in There are, like, 40 undecillion flavor choices, and I can’t decide!

Example: This code cipher has over 1 undecillion possible combinations, making it nearly impossible to decode.

The first records of the term undecillion are from around the 1930s. It comes from the Latin ū��, meaning “one,” -decem, meaning “10,” and -illion, as in “million.”��

What are some other forms related to undecillion?

• undecillionth (adjective, noun)

What are some words that share a root or word element with undecillion?��

• decillion
• decimal
• billion
• million
• trillion

What are some words that often get used in discussing undecillion?

• exponential
• large
• magnitude
• power

Undecillion is an extremely large number that is normally only used in specific scientific or mathematical contexts. Because of its size, undecillion is sometimes used figuratively.

Now that we have 280 characters, let's see if we can type out the total # of addresses: 340 undecillion, 282 decillion, 366 nonillion, 920 octillion, 938 septillion, 463 sextillion, 463 quintillion, 374 quadrillion, 607 trillion, 431 billion, 768 million, 211 thousand & 456

— ARIN (@TeamARIN)

TFW you get your back-of-napkin math wrong, and realize you said 1000¹² when you meant 12¹⁰⁰⁰.
"Undecillion" is cool, but not big enough.

— Howard Tayler (@howardtayler)

There are more IPv6 addresses than stars in our galaxy. 340 undecillion (trillion, trillion, trillion) vs. 100 billion

— rodbeckstrom (@RodBeckstrom)

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True or False?

In the United States, an undecillion is the same as 10³⁶, or 1 with 36 zeros after it.