4 APR-1400 will cost the UAE ~ $24.4 bn to complete. So $600 bn will give you 98 APR-1400 reactors, for a total of 131GW of electrical power – not to mention twice that in thermal power, which can be used for central heating, hydrogen production, etc.
This thermal energy is currently ignored in almost all calculations; it makes little sense to include it in a debate that only focuses on electricity, but at the same time it makes little sense to have such a debate (unless one is a lobbyist), when the use-case is much broader.
The most expensive part of nuclear energy are the capital costs – the discount rate in particular – since it is a "everything up front"-project, where political scrutiny is extremely high (much of it for good reason, but too much is mainly the 'vetocracy' and NIMBYism in action) and the low amount of new plants being built is limiting the build-up of knowledge.
In my native country of Denmark, there is basically zero research in nuclear compared to other energy sources; even in the institutions that were led or founded by the Nobel-prize winning Danish physicist, Niels Bohr. That is all due to politics and it shifts the debate to be less and less about science, which is one of the saddest things to happen.