Is there a reasonably simple way to create a torus with minimal vertices and faces (that is no artifacts from merging extrusions) with more than 256 segments (in my case 1800 major segments and 360 minor segments) with a major radius of about 900m and a minor radius of about 50m?
Start by adding a circle, with 360 vertices, a radius of 50, and the Fill Type set to Nothing.
In edit mode rotate the circle along the Y axis by 90°. Then move the circle 900 along the Y axis.
Last add a Screw modifier, with Steps and Render Steps set to 1800. Leave all other modifier settings to default.
You now have a torus with 648,000 vertices and faces; 1800 major segments and 360 minor segments.