165131565 has 16 divisors (see below), whose sum is σ = 278116800. Its totient is φ = 83434752.

The previous prime is 165131537. The next prime is 165131569. The reversal of 165131565 is 565131561.

It is not a de Polignac number, because 165131565 - 2¹⁰ = 165130541 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165131569) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 289420 + ... + 289989.

It is an arithmetic number, because the mean of its divisors is an integer number (17382300).

Almost surely, 2^165131565 is an apocalyptic number.

165131565 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

165131565 is a deficient number, since it is larger than the sum of its proper divisors (112985235).

165131565 is a wasteful number, since it uses less digits than its factorization.

165131565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 579436.

The product of its digits is 13500, while the sum is 33.

The square root of 165131565 is about 12850.3527188945. The cubic root of 165131565 is about 548.6263960239.

The spelling of 165131565 in words is "one hundred sixty-five million, one hundred thirty-one thousand, five hundred sixty-five".