164511565 has 4 divisors (see below), whose sum is σ = 197413884. Its totient is φ = 131609248.

The previous prime is 164511563. The next prime is 164511569. The reversal of 164511565 is 565115461.

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 84695209 + 79816356 = 9203^2 + 8934^2 .

It is a cyclic number.

It is not a de Polignac number, because 164511565 - 2¹ = 164511563 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 164511565.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (164511563) 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, 16451152 + ... + 16451161.

It is an arithmetic number, because the mean of its divisors is an integer number (49353471).

Almost surely, 2^164511565 is an apocalyptic number.

It is an amenable number.

164511565 is a deficient number, since it is larger than the sum of its proper divisors (32902319).

164511565 is an equidigital number, since it uses as much as digits as its factorization.

164511565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32902318.

The product of its digits is 18000, while the sum is 34.

The square root of 164511565 is about 12826.2061810966. The cubic root of 164511565 is about 547.9389139734.

The spelling of 164511565 in words is "one hundred sixty-four million, five hundred eleven thousand, five hundred sixty-five".