166566656 has 36 divisors (see below), whose sum is σ = 335763792. Its totient is φ = 82461696.

The previous prime is 166566643. The next prime is 166566677. The reversal of 166566656 is 656665661.

It is a self number, because there is not a number n which added to its sum of digits gives 166566656.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 23210 + ... + 29526.

It is an arithmetic number, because the mean of its divisors is an integer number (9326772).

Almost surely, 2^166566656 is an apocalyptic number.

166566656 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 166566656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (167881896).

166566656 is an abundant number, since it is smaller than the sum of its proper divisors (169197136).

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

166566656 is an equidigital number, since it uses as much as digits as its factorization.

166566656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6436 (or 6422 counting only the distinct ones).

The product of its digits is 1166400, while the sum is 47.

The square root of 166566656 is about 12906.0705096478. The cubic root of 166566656 is about 550.2111101424.

The spelling of 166566656 in words is "one hundred sixty-six million, five hundred sixty-six thousand, six hundred fifty-six".