165545851 has 8 divisors (see below), whose sum is σ = 166471200. Its totient is φ = 164623872.

The previous prime is 165545827. The next prime is 165545857. The reversal of 165545851 is 158545561.

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 165545851 - 2⁵ = 165545819 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165545857) 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, 225481 + ... + 226213.

It is an arithmetic number, because the mean of its divisors is an integer number (20808900).

Almost surely, 2^165545851 is an apocalyptic number.

165545851 is a deficient number, since it is larger than the sum of its proper divisors (925349).

165545851 is an equidigital number, since it uses as much as digits as its factorization.

165545851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1685.

The product of its digits is 120000, while the sum is 40.

The square root of 165545851 is about 12866.4622565801. The cubic root of 165545851 is about 549.0848151925.

The spelling of 165545851 in words is "one hundred sixty-five million, five hundred forty-five thousand, eight hundred fifty-one".