In space away from the earth’s atmosphere what color does the sun look like ?

This is a question about what the human eye and human brain say about receiving the whole spectrum of the Sun. The answer is: 5780K (degrees Kelvin). Is that white? Well, not exactly. According to the International Commission on Illumination (CIE) a definition of White is illuminant D65 which has a color temperature 6504K. D65 is daylight white, which is the lighting from the combination of a slightly off-white (toward yellow) Sun in a blue sky. We see that combination of sources of light as: white.

Viewed from the Earth's surface when the Sun is high in the sky (least atmospheric reddening), the effective color temperature is 5780K (see the color temperature reference below). Viewed while in space (no atmospheric reddening), the true color temperature of the Sun is 5900K (still slightly off-white on the yellow side).

If the Sun's light is split into its component colors by atmospheric mist, or a prism, the strongest component color coming from the Sun is green.

Combining colors of light is additive. You can see in the second reference below, that when you combine red, green, and blue light, the result is white. So the Sun's light is mostly white-looking, not green, because of all the other colors from the Sun combined with its green light component.

The human eye's color response is overloaded by something as bright as the Sun. So if you try to look at the Sun, it just looks white. It's better to look at white paper illuminated by the Sun. If you had a strong light source of 6500K color and projected that on the paper for comparison, you would see that it is whiter-looking than the paper is when illuminated by the Sun only.

Astronomers classify stars by their color. They use what's called the Harvard System. (See the third reference.) The Sun is a G2 star, in terms of the Harvard System. The 2 means that it is 1/5 of the way (0 through 9) from G to K color. A truly white star is in category A. Examples of category A stars are: Sirius, Vega, and Deneb.

greenish yellow, based on the surface temperature

White. It alsoooks?white with the atmosphere.. It just seems to be yellow because you normally dontblike at Sun directly. Yellows is the complementary color to the  cyan of a blue sky. 

Blue-white, slightly tinged yellow. Just like all other G-class stars.

It looks like a star, which is what it is.  Not a very big star as stars go.  You wouldn't see the planets.

white