Arcology

Massive skyscraper. On Terra one per 94km². Connected with vacuum trains. From borderline of mantle up to up to Orbital rings. Cone with approximately 6km in diameter at the base. Approx 1000 inhabbited floors. Earch housing million people.
Total 5 412 329 arcologies on Terra, housing over 5 400 000 000 000 (5,4 quadrillion) people.
Inner areas contain slums.