Yes, 65535.co.uk can receive emails.
Yes, 65535.co.uk seems to be a legitimate domain.
A record
None
MX records
ALT1.ASPMX.L.GOOGLE.COM
64.233.190.26
ALT2.ASPMX.L.GOOGLE.COM
209.85.202.27
ASPMX.L.GOOGLE.COM
172.217.197.26
ASPMX2.GOOGLEMAIL.COM
64.233.190.26
ASPMX3.GOOGLEMAIL.COM
209.85.202.27
ASPMX4.GOOGLEMAIL.COM
108.177.15.26
ASPMX5.GOOGLEMAIL.COM
108.177.119.26