165180423 has 4 divisors (see below), whose sum is σ = 220240568. Its totient is φ = 110120280.

The previous prime is 165180403. The next prime is 165180437. The reversal of 165180423 is 324081561.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 324081561 = 3 ⋅108027187.

It is not a de Polignac number, because 165180423 - 2⁶ = 165180359 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165180403) 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 3 ways as a sum of consecutive naturals, for example, 27530068 + ... + 27530073.

It is an arithmetic number, because the mean of its divisors is an integer number (55060142).

Almost surely, 2^165180423 is an apocalyptic number.

165180423 is a deficient number, since it is larger than the sum of its proper divisors (55060145).

165180423 is an equidigital number, since it uses as much as digits as its factorization.

165180423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55060144.

The product of its (nonzero) digits is 5760, while the sum is 30.

The square root of 165180423 is about 12852.2536156115. The cubic root of 165180423 is about 548.6804986325.

The spelling of 165180423 in words is "one hundred sixty-five million, one hundred eighty thousand, four hundred twenty-three".