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A giga tonne.
It is not normal to say giga-kilo (this would actually be tera). Anyway giga means 109 or a billion
A ton - sometimes called "metric ton", to avoid confusion with the other ton - is equal to 1000 kilograms. Metric prefixes (Mega, Giga, Tera, ...) might be used for larger units, but it is customary to specify larger masses either in kilograms or in tons.
2,737,911.692080762 give or take
one