Vigintillion

A vigintillion is equal to 1063 in the short scale, or 10120 in the long scale. It is the largest -illion with a recognized name in the English language other than the much larger centillion, although the extended names to the -illions like unvigintillion have been recognized by many people as well. It is 64 digits long in short scale, and 121 digits long in long scale.

In the long scale, 1063 is called decilliard, which is commonly used in France and Germany.

This number is also called icosihenillion in Russ Rowlett's Greek-based naming system of -illions.

Aarex Tiaokhiao gave the name vigimillion, referring to the value of this number.

Decimal expansion

 * 1,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000 - short scale
 * 1,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000 - long scale

Examples

 * The volume of the Virgo Super Cluster (The super cluster in which we reside) is roughly 3.54 vigintillion cubic kilometers.
 * There is about 1 vigintillion possible chess combinations.
 * For prefixes that mean multipling by one vigintillion, see Prefix 10^63.
 * One vigintillion (1×1063) is Archimedes' estimate in The Sand Reckoner of the total number of grains of sand that could fit into the entire cosmos, the diameter of which he estimated in stadia to be what we call 2 light years.

Approximations
For short scale: For long scale: