165261275 has 6 divisors (see below), whose sum is σ = 204924012. Its totient is φ = 132209000.

The previous prime is 165261263. The next prime is 165261307. The reversal of 165261275 is 572162561.

It is not a de Polignac number, because 165261275 - 2⁶ = 165261211 is a prime.

It is a super-3 number, since 3×165261275³ (a number of 26 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3305201 + ... + 3305250.

It is an arithmetic number, because the mean of its divisors is an integer number (34154002).

Almost surely, 2^165261275 is an apocalyptic number.

165261275 is a deficient number, since it is larger than the sum of its proper divisors (39662737).

165261275 is an equidigital number, since it uses as much as digits as its factorization.

165261275 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6610461 (or 6610456 counting only the distinct ones).

The product of its digits is 25200, while the sum is 35.

The square root of 165261275 is about 12855.3986713754. The cubic root of 165261275 is about 548.7700061718.

The spelling of 165261275 in words is "one hundred sixty-five million, two hundred sixty-one thousand, two hundred seventy-five".