165505249 has 24 divisors (see below), whose sum is σ = 211471872. Its totient is φ = 126696960.

The previous prime is 165505247. The next prime is 165505279. The reversal of 165505249 is 942505561.

It is not a de Polignac number, because 165505249 - 2¹ = 165505247 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165505247) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 34417 + ... + 38929.

It is an arithmetic number, because the mean of its divisors is an integer number (8811328).

Almost surely, 2^165505249 is an apocalyptic number.

It is an amenable number.

165505249 is a deficient number, since it is larger than the sum of its proper divisors (45966623).

165505249 is a wasteful number, since it uses less digits than its factorization.

165505249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4577 (or 4564 counting only the distinct ones).

The product of its (nonzero) digits is 54000, while the sum is 37.

The square root of 165505249 is about 12864.8843368295. The cubic root of 165505249 is about 549.0399217599.

The spelling of 165505249 in words is "one hundred sixty-five million, five hundred five thousand, two hundred forty-nine".