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The year 1013 AD.
17 trillion seconds = approx 540 thousand years.
One billion seconds ago is roughly the equivalent of 31.7 years ago, using the US definition of one billion. One billion is one thousand millions.
No. The origins of algebra can be traced back to ancient Babylonia mathematicians roughly four thousand years ago.
Prime factors were discovered by mathematicians in Greece, Egypt, and other Mediterranean countries several thousand years ago.