165216301 has 4 divisors (see below), whose sum is σ = 167479612. Its totient is φ = 162952992.

The previous prime is 165216287. The next prime is 165216349. The reversal of 165216301 is 103612561.

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

It can be written as a sum of positive squares in 2 ways, for example, as 47472100 + 117744201 = 6890^2 + 10851^2 .

It is a cyclic number.

It is not a de Polignac number, because 165216301 - 2⁷ = 165216173 is a prime.

It is a super-2 number, since 2×165216301² = 54592852232245202, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165211301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1131546 + ... + 1131691.

It is an arithmetic number, because the mean of its divisors is an integer number (41869903).

Almost surely, 2^165216301 is an apocalyptic number.

It is an amenable number.

165216301 is a deficient number, since it is larger than the sum of its proper divisors (2263311).

165216301 is an equidigital number, since it uses as much as digits as its factorization.

165216301 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2263310.

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 165216301 is about 12853.6493261641. The cubic root of 165216301 is about 548.7202211240.

Adding to 165216301 its reverse (103612561), we get a palindrome (268828862).

It can be divided in two parts, 16521 and 6301, that added together give a palindrome (22822).

The spelling of 165216301 in words is "one hundred sixty-five million, two hundred sixteen thousand, three hundred one".