166557171 has 8 divisors (see below), whose sum is σ = 242265024. Its totient is φ = 100943720.

The previous prime is 166557169. The next prime is 166557187. The reversal of 166557171 is 171755661.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 166557171 - 2¹ = 166557169 is a prime.

It is not an unprimeable number, because it can be changed into a prime (166557151) 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 7 ways as a sum of consecutive naturals, for example, 2523561 + ... + 2523626.

It is an arithmetic number, because the mean of its divisors is an integer number (30283128).

Almost surely, 2^166557171 is an apocalyptic number.

166557171 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

166557171 is a deficient number, since it is larger than the sum of its proper divisors (75707853).

166557171 is a wasteful number, since it uses less digits than its factorization.

166557171 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5047201.

The product of its digits is 44100, while the sum is 39.

The square root of 166557171 is about 12905.7030416789. The cubic root of 166557171 is about 550.2006661725.

The spelling of 166557171 in words is "one hundred sixty-six million, five hundred fifty-seven thousand, one hundred seventy-one".