166021564203012 has 24 divisors (see below), whose sum is σ = 442724171208256. Its totient is φ = 47434732629408.

The previous prime is 166021564202983. The next prime is 166021564203017. The reversal of 166021564203012 is 210302465120661.

It is not an unprimeable number, because it can be changed into a prime (166021564203017) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 988223596363 + ... + 988223596530.

Almost surely, 2^{166021564203012} is an apocalyptic number.

166021564203012 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

166021564203012 is an abundant number, since it is smaller than the sum of its proper divisors (276702607005244).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

166021564203012 is a wasteful number, since it uses less digits than its factorization.

166021564203012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1976447192907 (or 1976447192905 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 39.

The spelling of 166021564203012 in words is "one hundred sixty-six trillion, twenty-one billion, five hundred sixty-four million, two hundred three thousand, twelve".