165221303 has 8 divisors (see below), whose sum is σ = 178864896. Its totient is φ = 151711200.

The previous prime is 165221293. The next prime is 165221333. The reversal of 165221303 is 303122561.

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 165221303 - 2²⁶ = 98112439 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 (165221333) 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, 30788 + ... + 35753.

It is an arithmetic number, because the mean of its divisors is an integer number (22358112).

Almost surely, 2^165221303 is an apocalyptic number.

165221303 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

165221303 is a deficient number, since it is larger than the sum of its proper divisors (13643593).

165221303 is a wasteful number, since it uses less digits than its factorization.

165221303 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66745.

The product of its (nonzero) digits is 1080, while the sum is 23.

The square root of 165221303 is about 12853.8438997834. The cubic root of 165221303 is about 548.7257586543.

Adding to 165221303 its reverse (303122561), we get a palindrome (468343864).

The spelling of 165221303 in words is "one hundred sixty-five million, two hundred twenty-one thousand, three hundred three".