164635565 has 8 divisors (see below), whose sum is σ = 209184120. Its totient is φ = 123960832.

The previous prime is 164635553. The next prime is 164635571. The reversal of 164635565 is 565536461.

It can be written as a sum of positive squares in 4 ways, for example, as 48038761 + 116596804 = 6931^2 + 10798^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 164635565 - 2⁸ = 164635309 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 968360 + ... + 968529.

It is an arithmetic number, because the mean of its divisors is an integer number (26148015).

Almost surely, 2^164635565 is an apocalyptic number.

It is an amenable number.

164635565 is a deficient number, since it is larger than the sum of its proper divisors (44548555).

164635565 is a wasteful number, since it uses less digits than its factorization.

164635565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1936911.

The product of its digits is 324000, while the sum is 41.

The square root of 164635565 is about 12831.0391239369. The cubic root of 164635565 is about 548.0765483935.

The spelling of 164635565 in words is "one hundred sixty-four million, six hundred thirty-five thousand, five hundred sixty-five".