166804091 has 8 divisors (see below), whose sum is σ = 170344944. Its totient is φ = 163277920.

The previous prime is 166804061. The next prime is 166804133. The reversal of 166804091 is 190408661.

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 166804091 - 2²⁶ = 99695227 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166804061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21020 + ... + 27846.

It is an arithmetic number, because the mean of its divisors is an integer number (21293118).

Almost surely, 2^166804091 is an apocalyptic number.

166804091 is a deficient number, since it is larger than the sum of its proper divisors (3540853).

166804091 is an equidigital number, since it uses as much as digits as its factorization.

166804091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7341.

The product of its (nonzero) digits is 10368, while the sum is 35.

The square root of 166804091 is about 12915.2658122084. The cubic root of 166804091 is about 550.4724216462.

The spelling of 166804091 in words is "one hundred sixty-six million, eight hundred four thousand, ninety-one".