March 17th 2018.  Just for reference.

Just downloaded the entire blockchain.

Number of blocks: 513,962

Download time: 2 days 3 hours

Size on disk: 172GB

Used an Amazon Web Services EC2 t2.small server instance, running Ubuntu. 2GB memory.  Was struggling a bit, hence the download time.  CPU running at 100% constantly.  Memory was fine but I think more would be needed if running a faster processor.  Not sure of the CPU specs on the t2.small instance but it's one of their lowest performing (and cheapest) instances.