urgent! i need help on how to copy & paste number ID from a webpage to excel

hi i need urgent help!!! I have been sitting in front of my desktop trying to copy and paste only numbers ID from a webpage to excel but to no avail regardless spending exceeding 2 hours experimenting how to set it right in excel. after pasting in the column, when i click away, that particular column's pasted number would auto change to 5.80948E+17. pls pls help me guiding me step-by-step tutorial thanks