Hi, after doing some research, there are no alloys that are anywhere near the resistance per meter (or foot) that you have 'calculated'.
Tungsten is over 150 times lower in resistance per unit length than Evanohm, Tungsten, the smallest diameter wire I could find was 0,000,3" diameter, if it could be drawn to 2um diameter would be 17984 ohm per meter while Evanohm, at the same diameter, would be 65.616,8 ohm per meter. That is using the most common form of Evanohm 800 alloy, there are also a 825 and 875 alloy variants of Evanohm which would increase the resistance a little bit further. The TCR of Tungsten is +45 PPM/°C.
There are absolutely no pure metal or alloy that gets anywhere near 860K/m in a wire form, even at 2um diameter, even 1um wouldn't get you there even if a wire could be drawn that tiny (Gold is the only candidate here and its resistance is far too low).
While I am not directly disputing your measurement of the wire's diameter (how accurate?), the resistance per meter and calculated length are not possible.