YouTube Access Issue Fix and Phone Hacked

I'm facing a 404 error on YouTube, and it shows 0 comments. I've tried accessing it on a smartphone, using Google Chrome, and I've already cleared my browser's cache and cookies.

Additionally, my Android phone has been hacked, and someone accessed my Google passwords from another device. I need assistance securing my phone and accounts.

I'm looking for someone with:
- Expertise in troubleshooting YouTube and browser issues
- Familiarity with Google Chrome
- Experience in resolving 404 errors
- Expertise in Android security and account recovery

Please provide a step-by-step guide or fix the problems directly.