164056565 has 4 divisors (see below), whose sum is σ = 196867884. Its totient is φ = 131245248.

The previous prime is 164056561. The next prime is 164056589. The reversal of 164056565 is 565650461.

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 29658916 + 134397649 = 5446^2 + 11593^2 .

It is a cyclic number.

It is not a de Polignac number, because 164056565 - 2² = 164056561 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (164056561) 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, 16405652 + ... + 16405661.

It is an arithmetic number, because the mean of its divisors is an integer number (49216971).

Almost surely, 2^164056565 is an apocalyptic number.

It is an amenable number.

164056565 is a deficient number, since it is larger than the sum of its proper divisors (32811319).

164056565 is an equidigital number, since it uses as much as digits as its factorization.

164056565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32811318.

The product of its (nonzero) digits is 108000, while the sum is 38.

The square root of 164056565 is about 12808.4567766769. The cubic root of 164056565 is about 547.4332911502.

The spelling of 164056565 in words is "one hundred sixty-four million, fifty-six thousand, five hundred sixty-five".