166005666 has 16 divisors (see below), whose sum is σ = 368901600. Its totient is φ = 55335204.

The previous prime is 166005659. The next prime is 166005667. The reversal of 166005666 is 666500661.

It is a super-2 number, since 2×166005666² = 55115762288207112, which contains 22 as substring.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 166005666.

It is not an unprimeable number, because it can be changed into a prime (166005667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1537036 + ... + 1537143.

It is an arithmetic number, because the mean of its divisors is an integer number (23056350).

Almost surely, 2^166005666 is an apocalyptic number.

166005666 is an abundant number, since it is smaller than the sum of its proper divisors (202895934).

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

166005666 is a wasteful number, since it uses less digits than its factorization.

166005666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3074190 (or 3074184 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 36.

The square root of 166005666 is about 12884.3186082928. The cubic root of 166005666 is about 549.5927188639.

The spelling of 166005666 in words is "one hundred sixty-six million, five thousand, six hundred sixty-six".