165091265 has 4 divisors (see below), whose sum is σ = 198109524. Its totient is φ = 132073008.

The previous prime is 165091261. The next prime is 165091271. The reversal of 165091265 is 562190561.

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 45144961 + 119946304 = 6719^2 + 10952^2 .

It is a cyclic number.

It is not a de Polignac number, because 165091265 - 2² = 165091261 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165091261) 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, 16509122 + ... + 16509131.

It is an arithmetic number, because the mean of its divisors is an integer number (49527381).

Almost surely, 2^165091265 is an apocalyptic number.

It is an amenable number.

165091265 is a deficient number, since it is larger than the sum of its proper divisors (33018259).

165091265 is an equidigital number, since it uses as much as digits as its factorization.

165091265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33018258.

The product of its (nonzero) digits is 16200, while the sum is 35.

The square root of 165091265 is about 12848.7845728691. The cubic root of 165091265 is about 548.5817620324.

The spelling of 165091265 in words is "one hundred sixty-five million, ninety-one thousand, two hundred sixty-five".