165725539 has 8 divisors (see below), whose sum is σ = 190460160. Its totient is φ = 141255816.

The previous prime is 165725533. The next prime is 165725561. The reversal of 165725539 is 935527561.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 165725539 - 2³ = 165725531 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 165725495 and 165725504.

It is not an unprimeable number, because it can be changed into a prime (165725531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 64879 + ... + 67384.

It is an arithmetic number, because the mean of its divisors is an integer number (23807520).

Almost surely, 2^165725539 is an apocalyptic number.

165725539 is a deficient number, since it is larger than the sum of its proper divisors (24734621).

165725539 is a wasteful number, since it uses less digits than its factorization.

165725539 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132449.

The product of its digits is 283500, while the sum is 43.

The square root of 165725539 is about 12873.4431680106. The cubic root of 165725539 is about 549.2834072556.

The spelling of 165725539 in words is "one hundred sixty-five million, seven hundred twenty-five thousand, five hundred thirty-nine".