166217165 has 8 divisors (see below), whose sum is σ = 199534848. Its totient is φ = 132924240.

The previous prime is 166217153. The next prime is 166217167. The reversal of 166217165 is 561712661.

166217165 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 166217165 - 2⁸ = 166216909 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166217167) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15500 + ... + 23930.

It is an arithmetic number, because the mean of its divisors is an integer number (24941856).

Almost surely, 2^166217165 is an apocalyptic number.

It is an amenable number.

166217165 is a deficient number, since it is larger than the sum of its proper divisors (33317683).

166217165 is an equidigital number, since it uses as much as digits as its factorization.

166217165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12379.

The product of its digits is 15120, while the sum is 35.

The square root of 166217165 is about 12892.5236086656. The cubic root of 166217165 is about 549.8260221075.

The spelling of 166217165 in words is "one hundred sixty-six million, two hundred seventeen thousand, one hundred sixty-five".