Quote:
(have also used /hadd stats tfactprod $calc($hget(stats,tfactprod) + %tot) with the same outcome)

Hm, I can use hadd with $calc() and get the right result
Code:
//var %a = 2099721840,%b = 74040191 |  hadd -m test a %a | hadd test a $calc($hget(test,a) + %b) | echo -ag * $hget(test,a) == $calc(%a + %b) | hfree test

* 2173762031 == 2173762031