The 66 Lottery application comes delivered through an APK and not through the Play Store. That is normal across this category of apps in India - though it places every verification work rests with you.
The Reason the App Is Not on the Play Store
Store policy limits real-money apps in several countries, India being one. Off-store distribution stays the result. This is by itself no proof of dishonesty - and it is also not any guarantee regarding legitimacy.
Prior to You Click Install
First, load the download page by entering the address directly, not by following a shared link. Second, record the listed APK size and version string, and match those to the download lands on the phone. Third, put the package via Play Protect.
The Access Screen
The gaming app requires internet and
storage permission. Requests for your address book, SMS inbox, phone logs or device-administrator access represent cause to abandon the process immediately.
The Install Properly
If
Android asks, grant sideloading for the specific app in question and nothing more, and immediately switch the allowance off again. Never leaving unknown sources" enabled across the phone.
Once the First Launch
Watch what the app acts first. Instant deposit prompts, full-screen ads, or forced movement into a separate unrelated channel each call for removal.
Apple Users
iOS will not allow this kind of distribution, so an web option - often pinned as an home-screen shortcut - remains the practical option.
An independent reference at
66 Lottery sets out the verification steps with detail, as a couple of minutes of checking avoids the single most costly mistake in the category.