166557163 has 4 divisors (see below), whose sum is σ = 168113880. Its totient is φ = 165000448.

The previous prime is 166557161. The next prime is 166557169. The reversal of 166557163 is 361755661.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 166557163 - 2¹ = 166557161 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166557161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 778198 + ... + 778411.

It is an arithmetic number, because the mean of its divisors is an integer number (42028470).

Almost surely, 2^166557163 is an apocalyptic number.

166557163 is a deficient number, since it is larger than the sum of its proper divisors (1556717).

166557163 is a wasteful number, since it uses less digits than its factorization.

166557163 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1556716.

The product of its digits is 113400, while the sum is 40.

The square root of 166557163 is about 12905.7027317384. The cubic root of 166557163 is about 550.2006573635.

The spelling of 166557163 in words is "one hundred sixty-six million, five hundred fifty-seven thousand, one hundred sixty-three".