split -b 2m node-v5.11.1-linux-x64.tar part_

Will produce:

part_aa
part_ab
part_ac
etc etc (in this case each file above will be 2MB in size)

Now concatenate the parts:

cat part*  >  node-v5.11.1-linux-x64.tar

NOTE: if you run a file on one of the parts you can see details of the original file