165446321 has 4 divisors (see below), whose sum is σ = 166542144. Its totient is φ = 164350500.

The previous prime is 165446297. The next prime is 165446371. The reversal of 165446321 is 123644561.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 123644561 = 41 ⋅3015721.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-165446321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165446371) 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, 547685 + ... + 547986.

It is an arithmetic number, because the mean of its divisors is an integer number (41635536).

Almost surely, 2^165446321 is an apocalyptic number.

It is an amenable number.

165446321 is a deficient number, since it is larger than the sum of its proper divisors (1095823).

165446321 is a wasteful number, since it uses less digits than its factorization.

165446321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1095822.

The product of its digits is 17280, while the sum is 32.

The square root of 165446321 is about 12862.5938674903. The cubic root of 165446321 is about 548.9747522958.

The spelling of 165446321 in words is "one hundred sixty-five million, four hundred forty-six thousand, three hundred twenty-one".