164109565 has 4 divisors (see below), whose sum is σ = 196931484. Its totient is φ = 131287648.

The previous prime is 164109563. The next prime is 164109607. The reversal of 164109565 is 565901461.

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 96393124 + 67716441 = 9818^2 + 8229^2 .

It is a cyclic number.

It is not a de Polignac number, because 164109565 - 2¹ = 164109563 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (164109563) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16410952 + ... + 16410961.

It is an arithmetic number, because the mean of its divisors is an integer number (49232871).

Almost surely, 2^164109565 is an apocalyptic number.

It is an amenable number.

164109565 is a deficient number, since it is larger than the sum of its proper divisors (32821919).

164109565 is an equidigital number, since it uses as much as digits as its factorization.

164109565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32821918.

The product of its (nonzero) digits is 32400, while the sum is 37.

The square root of 164109565 is about 12810.5255551831. The cubic root of 164109565 is about 547.4922359428.

The spelling of 164109565 in words is "one hundred sixty-four million, one hundred nine thousand, five hundred sixty-five".