There is no one wire that is rated for 1800 amps. The service will have to be a quad parallel of the conductors. A 600 MCM conductor with an insulation factor of 90 degrees C is rated at 475 amps. This conductor paralleled into four equal lengths will give an ampacity of 1900 amps for each leg of the service.
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#6 bare copper wire.
As a service entrance wire you need AWG # 3/0 gauge copper.
A 100 amp residential service requires a size #8 copper wire, it should be insulated in green.
Service entrance wire should be AWG #3 copper.
2 copper