It is a semiprime because it is the product of two primes.
It is a cyclic number.
It is a Duffinian number.
It is a congruent number.
Almost surely, 2166021564203013 is an apocalyptic number.
It is an amenable number.
166021564203013 is an equidigital number, since it uses as much as digits as its factorization.
166021564203013 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 2274268002854.
The spelling of 166021564203013 in words is "one hundred sixty-six trillion, twenty-one billion, five hundred sixty-four million, two hundred three thousand, thirteen".