166057 has 4 divisors (see below), whose sum is σ = 167056. Its totient is φ = 165060.

The previous prime is 166043. The next prime is 166063. The reversal of 166057 is 750661.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166057 is a prime.

It is the 408-th Hogben number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166027) by changing a digit.

It is a nontrivial repunit in base 407.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 183 + ... + 604.

It is an arithmetic number, because the mean of its divisors is an integer number (41764).

2¹⁶⁶⁰⁵⁷ is an apocalyptic number.

It is an amenable number.

166057 is a deficient number, since it is larger than the sum of its proper divisors (999).

166057 is an equidigital number, since it uses as much as digits as its factorization.

166057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 998.

The product of its (nonzero) digits is 1260, while the sum is 25.

The square root of 166057 is about 407.5009202444. The cubic root of 166057 is about 54.9649363286.

The spelling of 166057 in words is "one hundred sixty-six thousand, fifty-seven".