166566636 has 18 divisors (see below), whose sum is σ = 421043532. Its totient is φ = 55522200.

The previous prime is 166566613. The next prime is 166566643. The reversal of 166566636 is 636665661.

It is a tau number, because it is divible by the number of its divisors (18).

It is a junction number, because it is equal to n+sod(n) for n = 166566591 and 166566600.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2313390 + ... + 2313461.

Almost surely, 2^166566636 is an apocalyptic number.

It is an amenable number.

166566636 is an abundant number, since it is smaller than the sum of its proper divisors (254476896).

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

166566636 is a wasteful number, since it uses less digits than its factorization.

166566636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4626861 (or 4626856 counting only the distinct ones).

The product of its digits is 699840, while the sum is 45.

The square root of 166566636 is about 12906.0697348186. The cubic root of 166566636 is about 550.2110881207.

The spelling of 166566636 in words is "one hundred sixty-six million, five hundred sixty-six thousand, six hundred thirty-six".