The long scale is a way of writing numbers based on -illions and -illiards (in contrast to the short scale which uses only -illions). Formerly used in the UK, it is no longer used in English-speaking countries. Many other languages such as French and German use the long scale. Numbers in this scale are named due to that they are based off of powers of 1 million.
- Separate the number to blocks by three starting from 0.
- Substitute the n-th separator with (n/2)-th Latin prefix. If the position of the separator is odd, then add -illion to the prefix, otherwise add -illiard. The 0-th separator is replaced by thousand.
- 65,536 = 65 thousand 536
- 563,535,443 = 563 million 535 thousand 443
- 12,782,303,323 = 12 milliard 782 million 303 thousand 323
- 7,625,597,484,987 = 7 billion 625 milliard 597 million 484 thousand 987
- 59,765,752,000,000,000 = 59 billiard 765 billion 752 milliard
- 1,304,067,000,000,000,000 = 1 trillion 304 billiard 67 billion
There is a variation which uses only -illions. In this variation, a full six digit number is put to the right of each -illion so that -illiards aren't needed. One x-illiard is one thousand x-illion.