165216349 has 2 divisors, whose sum is σ = 165216350. Its totient is φ = 165216348.

The previous prime is 165216287. The next prime is 165216437. The reversal of 165216349 is 943612561.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 151659225 + 13557124 = 12315^2 + 3682^2 .

It is a cyclic number.

It is not a de Polignac number, because 165216349 - 2⁷ = 165216221 is a prime.

It is a Chen prime.

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

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (165216049) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82608174 + 82608175.

It is an arithmetic number, because the mean of its divisors is an integer number (82608175).

Almost surely, 2^165216349 is an apocalyptic number.

It is an amenable number.

165216349 is a deficient number, since it is larger than the sum of its proper divisors (1).

165216349 is an equidigital number, since it uses as much as digits as its factorization.

165216349 is an evil number, because the sum of its binary digits is even.

The product of its digits is 38880, while the sum is 37.

The square root of 165216349 is about 12853.6511933380. The cubic root of 165216349 is about 548.7202742635.

The spelling of 165216349 in words is "one hundred sixty-five million, two hundred sixteen thousand, three hundred forty-nine".