166790171 has 4 divisors (see below), whose sum is σ = 166828200. Its totient is φ = 166752144.

The previous prime is 166790167. The next prime is 166790201. The reversal of 166790171 is 171097661.

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 166790171 - 2² = 166790167 is a prime.

It is a super-2 number, since 2×166790171² = 55637922284418482, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166790101) 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, 11426 + ... + 21543.

It is an arithmetic number, because the mean of its divisors is an integer number (41707050).

Almost surely, 2^166790171 is an apocalyptic number.

166790171 is a deficient number, since it is larger than the sum of its proper divisors (38029).

166790171 is an equidigital number, since it uses as much as digits as its factorization.

166790171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38028.

The product of its (nonzero) digits is 15876, while the sum is 38.

The square root of 166790171 is about 12914.7269038102. The cubic root of 166790171 is about 550.4571086939.

The spelling of 166790171 in words is "one hundred sixty-six million, seven hundred ninety thousand, one hundred seventy-one".