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The issue you’re encountering with GA4 is a known bug. The system is mistakenly converting your 37-digit number value into an exponential format. A simple workaround is to add a non-numeric symbol, like a dot, at the end of your number value, such as 86594184624443841463509305394505323179.
When I’m sending a Client ID to GA4 as a custom dimension, the same thing happens – it transforms it to a number. So, I just add a dot at the end and then manually remove it in the exported reports. I know it’s not ideal, but until the bug is fixed, this should allow you to view your data correctly.
