554

554 = 2 x 277.

554 has a representation as a sum of two squares: 554 = 5² + 23².

554 is the maximum number of regions into which 24 circles can divide a plane.

554 is the number of self-dual planar graphs with 20 edges.

554 is 202112 in base 3 and 20222 in base 4. It is 464 in base 11.

Source: What's Special About This Number?