164242565 has 8 divisors (see below), whose sum is σ = 197167608. Its totient is φ = 131343040.

The previous prime is 164242543. The next prime is 164242571. The reversal of 164242565 is 565242461.

It can be written as a sum of positive squares in 4 ways, for example, as 8916196 + 155326369 = 2986^2 + 12463^2 .

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

It is not a de Polignac number, because 164242565 - 2²⁴ = 147465349 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13319 + ... + 22491.

It is an arithmetic number, because the mean of its divisors is an integer number (24645951).

Almost surely, 2^164242565 is an apocalyptic number.

It is an amenable number.

164242565 is a deficient number, since it is larger than the sum of its proper divisors (32925043).

164242565 is an equidigital number, since it uses as much as digits as its factorization.

164242565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12759.

The product of its digits is 57600, while the sum is 35.

The square root of 164242565 is about 12815.7155477172. The cubic root of 164242565 is about 547.6400981454.

The spelling of 164242565 in words is "one hundred sixty-four million, two hundred forty-two thousand, five hundred sixty-five".