People have been trying to hack bitcoin from years and of course there haven't been any success, The network is extremely strong and is secure enough to stand till now, I am sure it wouldn't be hacked with a calculator or anything like that ever IMO.
well hacker would prefer hacking wallet or takeover the addresses control from people that's vurnerable rather than trying hard to hack the network which people said near to impossible,and the fact that i've seen few people got hacked their wallet and none case of network hacking