What are the properties and characteristics of a 7-sphere?

A 7-sphere is a seven-dimensional shape that is similar to a three-dimensional sphere. It is defined by having all points equidistant from a center point in seven dimensions. The properties of a 7-sphere include volume, surface area, and curvature, which are more complex to calculate compared to lower-dimensional spheres. Additionally, a 7-sphere is a topological space that is compact and simply connected.