165664529 has 4 divisors (see below), whose sum is σ = 165775680. Its totient is φ = 165553380.

The previous prime is 165664493. The next prime is 165664531. The reversal of 165664529 is 925466561.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 925466561 = 3119 ⋅296719.

It is a cyclic number.

It is not a de Polignac number, because 165664529 - 2²⁴ = 148887313 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 165664529.

It is not an unprimeable number, because it can be changed into a prime (165684529) 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 3 ways as a sum of consecutive naturals, for example, 53309 + ... + 56330.

It is an arithmetic number, because the mean of its divisors is an integer number (41443920).

Almost surely, 2^165664529 is an apocalyptic number.

It is an amenable number.

165664529 is a deficient number, since it is larger than the sum of its proper divisors (111151).

165664529 is a wasteful number, since it uses less digits than its factorization.

165664529 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111150.

The product of its digits is 388800, while the sum is 44.

The square root of 165664529 is about 12871.0733429656. The cubic root of 165664529 is about 549.2159948056.

The spelling of 165664529 in words is "one hundred sixty-five million, six hundred sixty-four thousand, five hundred twenty-nine".