166021564203018 has 80 divisors (see below), whose sum is σ = 384843433582080. Its totient is φ = 53431647814944.

The previous prime is 166021564203017. The next prime is 166021564203037. The reversal of 166021564203018 is 810302465120661.

166021564203018 is a `hidden beast` number, since 1 + 6 + 6 + 0 + 21 + 564 + 20 + 30 + 18 = 666.

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 39 ways as a sum of consecutive naturals, for example, 723786055 + ... + 724015397.

It is an arithmetic number, because the mean of its divisors is an integer number (4810542919776).

Almost surely, 2^{166021564203018} is an apocalyptic number.

166021564203018 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

166021564203018 is an abundant number, since it is smaller than the sum of its proper divisors (218821869379062).

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

166021564203018 is a wasteful number, since it uses less digits than its factorization.

166021564203018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 383473 (or 383464 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 45.

The spelling of 166021564203018 in words is "one hundred sixty-six trillion, twenty-one billion, five hundred sixty-four million, two hundred three thousand, eighteen".