The numbers per flight hour for helicopters are somewhere between commercial airlines and private small planes. If you go by traveled passenger miles there is a huge difference between commercial airlines and helicopters.
However there are also differences between helicopter operators. Large operators generally have better safety stats than small ones (better organsiations for maintenance and training). North America, EU, Japanese operators have better safety stats than South America, Eastern Europe, Central Asia and Afrika. These differences can be more than 100 fold in the statistics.
There are particularily dangerous flight regimes (hover in intermediate altitude above ground, hover in the mountains, landing in urban areas or on slopes) that are simply not possible with fixed wing aircraft. Therefore safety comparisons are even more difficult.
Landing with failed engines is possible with so called autorotation. This can be even possible with failed tail rotor, if there is sufficient forward speed and the stabilizer provides antitorque. This means in similar flight conditions where a fixed wing aircraft can land, a helicopter can land, too. However the gliding distance is much shorter.
Flying low is more dangerous than flying high and waterways are dangerous places to land with a helicopter.
I can't remember the exact numbers but way more than 3/4 of crashes are survived (probably depends on the definition of "crash").
If you want to see horrible safety stats then look for ultralight and Paragliding.