The key word in the above is "few," which implies that there are larger, including the Catholic Church. Whether the TSCC is among the richest, I'm not sure, but I think we can all agree that it is, by absolute and relative standards, a "rich" church.
What it TSCC.
In terms of "outreach," however, it is thoroughly insiginificant, no more than a barely perceptible blip on the radar screen of humanity.
You seem hung upt with the tiny impat you think the LDS Church hsa on the world. Granted, it is small in numbers and as far as religous beliefs it is a tiny part of the worlds religions. However, it is like the 5th largest denomination in the US.
Also, one could argue that in many ways it has a significant impact in the World far in excess of what one would expect for it numbers.
I am not sure how you define outreach but it may be worth discussin. Certainly the LDS Church has a number of who's who in American Politics and business far beyond what its should for its numbers. Amazingly this little insigificant Church is often one of the first to arrive with spearhead units at natural disaster scenes across the country and even world at times. Often the Church is mentioned in local press in a positive light for its humanitarian efforts when floods, hurricanes, earthquakes and so on hit.
Addionally like it or not, it does have cultural impact often larger then its numbers would typicaly allow and organization to have.
I think you are rather short sighted in the small amount of impact on the world this tiny sect has.