165505303 has 4 divisors (see below), whose sum is σ = 165542440. Its totient is φ = 165468168.

The previous prime is 165505289. The next prime is 165505321. The reversal of 165505303 is 303505561.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 165505303 - 2⁹ = 165504791 is a prime.

It is a super-2 number, since 2×165505303² = 54784010642243618, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165505363) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10800 + ... + 21157.

It is an arithmetic number, because the mean of its divisors is an integer number (41385610).

Almost surely, 2^165505303 is an apocalyptic number.

165505303 is a deficient number, since it is larger than the sum of its proper divisors (37137).

165505303 is an equidigital number, since it uses as much as digits as its factorization.

165505303 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37136.

The product of its (nonzero) digits is 6750, while the sum is 28.

The square root of 165505303 is about 12864.8864355656. The cubic root of 165505303 is about 549.0399814723.

The spelling of 165505303 in words is "one hundred sixty-five million, five hundred five thousand, three hundred three".