## English

### Numeral

1. A thousand million million million million: 1 followed by twenty-seven zeros, 1027.
• 2002 June 19, bruce, “Re: Australians did it again! (?)”, in alt.fan.robert-jordan (Usenet), message-ID <cs9qea.as3.ln@ID-92747.user.dfncis.de>:
Ugh. An Australian should use Australian numbers (the same as British), not American. 10^27 is 1,000 quadrillion (or a quadrilliard). An octillion would be 10^48.
• 2003 December 3, arie, “Re: Why Women "Test" Men, and What Men can Do About It”, in alt.support.loneliness (Usenet), message-ID <bqkc2m\$dg9\$1@news.tudelft.nl>:
Your estimation was quite accurate. In a body of 75 kg of water, there are roughly 2.5 x 10^28. That's 25 octillion (US) or 25 quadrilliard (EU).
• 2007, Reinhard Wobst, “Life After DES: New Methods, New Attacks”, in Angelika Shafir, transl., Cryptology Unlocked, John Wiley & Sons, Ltd, →ISBN, section 3 (IDEA: A Special-Class Algoritmh), subsection 5 (Cryptanalyzing IDEA), page 239:
There are weak keys in the sense that their use by foisting chosen plaintexts can be proved, which could be interesting for chip cards with a ‘burnt-in key’. First of all, however, these keys can be easily avoided—one only needs to XOR all subkeys with the hexadecimal number 0x0dae—and second, the probability that such a key can be caught is 2−96; that is about one out of 1029 randomly selected keys (this number even has a name: 100 quadrilliards).
• 2014 May 16, Lela Buckingham, “Chapter 3: Systems of Measurement”, in Fundamental Laboratory Mathematics: Required Calculations for the Medical Laboratory Professional, Philadelphia: F. A. Davis Company, →ISBN, Box 3-3: Terms for Large Numbers, page 47:
In the European system, 109 is a milliard, 1012 is a billion, 1015 is a billiard, 1018 is a trillion, 1021 is a trilliard, 1024 is a quadrillion, and 1027 is a quadrilliard. To avoid confusion in expressing these numbers, the SI prefixes are preferred.

## French

 1027 [a], [b], [c] ←  1021 ←  1024 1030  → 1033  → Cardinal (traditional spelling): un quadrilliard     Cardinal (post-1990 spelling): un-quadrilliard     Ordinal: quadrilliardième French Wikipedia article on 1027

### Pronunciation

• IPA(key): /kwa.dʁi.ljaʁ/, /ka.dʁi.ljaʁ/
•  Audio: (file)