166542171 has 4 divisors (see below), whose sum is σ = 222056232. Its totient is φ = 111028112.

The previous prime is 166542169. The next prime is 166542179. The reversal of 166542171 is 171245661.

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 166542171 - 2¹ = 166542169 is a prime.

It is not an unprimeable number, because it can be changed into a prime (166542179) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27757026 + ... + 27757031.

It is an arithmetic number, because the mean of its divisors is an integer number (55514058).

Almost surely, 2^166542171 is an apocalyptic number.

166542171 is a deficient number, since it is larger than the sum of its proper divisors (55514061).

166542171 is an equidigital number, since it uses as much as digits as its factorization.

166542171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55514060.

The product of its digits is 10080, while the sum is 33.

The square root of 166542171 is about 12905.1218901644. The cubic root of 166542171 is about 550.1841488055.

The spelling of 166542171 in words is "one hundred sixty-six million, five hundred forty-two thousand, one hundred seventy-one".