166645818 has 24 divisors (see below), whose sum is σ = 361303488. Its totient is φ = 55512072.

The previous prime is 166645811. The next prime is 166645837. The reversal of 166645818 is 818546661.

It is not an unprimeable number, because it can be changed into a prime (166645811) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 51105 + ... + 54267.

It is an arithmetic number, because the mean of its divisors is an integer number (15054312).

Almost surely, 2^166645818 is an apocalyptic number.

166645818 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

166645818 is an abundant number, since it is smaller than the sum of its proper divisors (194657670).

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

166645818 is a wasteful number, since it uses less digits than its factorization.

166645818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6098 (or 6095 counting only the distinct ones).

The product of its digits is 276480, while the sum is 45.

The square root of 166645818 is about 12909.1369967167. The cubic root of 166645818 is about 550.2982602654.

The spelling of 166645818 in words is "one hundred sixty-six million, six hundred forty-five thousand, eight hundred eighteen".