Too big to convert I'm afraid:
PS C:\WINDOWS\system32> [int64]::MaxValue
13404964290887995043 is longer by 1 char and exceeds the range. POwershell is working fine but it seems like the cmdlet has not accounted for the sessionID being longer. One way around it would likely be to use powershell with one of the invoke cmdlets to run the command at the cluster head.