#Pyth, 10 bytes

    .>zss_cz\#

[Try it online.][try] [Test suite.][test]

This is a translation of [Dennis' CJam answer][dennis]. I'm making it a community wiki, since I didn't come up with it.

###Explanation

          cz\#   split input at #
         _       reverse
        s        join
       s         cast to integer
    .>z          rotate input right

[try]: https://pyth.herokuapp.com/?code=.%3Ezss_cz\%23&input=%23%23%23%23%23%23219088736090042%23%23%23%23&debug=0
[test]: https://pyth.herokuapp.com/?code=.%3Ezss_cz\%23&test_suite=1&test_suite_input=%231%23%23%0A%23%234%23%23%0A1%23%23%23%231%0A1%23%23%23%232%0A%23026%23%23%23%0A%23000%23%23%23%0A%23%23%2382399%0A51379%2397%0A%2398%23%23%23%23%23%0A%23%23%23%23%23%23%234%23%23%0A60752%231183%0A%23%23%23%2399366800%23%23%0A%23%23%23%23%23%23%23%239%23%23%23%23%23%0A91%23%23%23%23%23515694837%0A%23%23%236114558%23%23%23%23%23%23%0A%23%23%23%23%23%23219088736090042%23%23%23%23%0A%2346055080150577874656291186550000138168%23%23%23%23%23%23%23%23%23%23%23%0A568375993099127531613012513406622393034741346840434468680494753262730615610086255892915828812820699971764142551702608639695081452206500085233149468399533981039485419872101852%23%23%23%23%23%23%23%23%23%23%23%23%23%23%23%23%23%23%23%23%23%233680&debug=0
[dennis]: http://codegolf.stackexchange.com/a/74106/30164