Donald Trump spent about $66 million of his own money on his 2016 campaign, according to Reuters reporting based on campaign-finance figures.

Context

That figure refers specifically to his personal contributions to the campaign, not the campaign’s total spending or all money raised.

Extra note

For a fuller picture, reports from the same period showed the Trump campaign also raised and spent additional funds from donors and outside groups, so the total cost of the effort was higher than his personal outlay.

Item| Amount
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Trump’s personal money in 2016 campaign| About $66 million

TL;DR: Trump’s own cash contribution to the 2016 campaign was about $66 million.