165686045 has 24 divisors (see below), whose sum is σ = 232272384. Its totient is φ = 111144096.

The previous prime is 165686021. The next prime is 165686047. The reversal of 165686045 is 540686561.

It is a happy number.

It is not a de Polignac number, because 165686045 - 2⁶ = 165685981 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 165685993 and 165686011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165686047) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 76244 + ... + 78386.

It is an arithmetic number, because the mean of its divisors is an integer number (9678016).

Almost surely, 2^165686045 is an apocalyptic number.

It is an amenable number.

165686045 is a deficient number, since it is larger than the sum of its proper divisors (66586339).

165686045 is an equidigital number, since it uses as much as digits as its factorization.

165686045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2249 (or 2202 counting only the distinct ones).

The product of its (nonzero) digits is 172800, while the sum is 41.

The square root of 165686045 is about 12871.9091435575. The cubic root of 165686045 is about 549.2397706049.

The spelling of 165686045 in words is "one hundred sixty-five million, six hundred eighty-six thousand, forty-five".