Niger is about 1,144 times bigger than Hong Kong.

Hong Kong is approximately 1,108 sq km, while Niger is approximately 1,267,000 sq km, making Niger 114,250% larger than Hong Kong. Meanwhile, the population of Hong Kong is ~7.3 million people (17.2 million more people live in Niger).
Tip: This to-scale comparison of Hong Kong vs. Niger uses the Mercator projection, which distorts the size of regions near the poles.