164011565 has 8 divisors (see below), whose sum is σ = 202133400. Its totient is φ = 127662912.

The previous prime is 164011531. The next prime is 164011567. The reversal of 164011565 is 565110461.

It can be written as a sum of positive squares in 4 ways, for example, as 39778249 + 124233316 = 6307^2 + 11146^2 .

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 164011565 - 2¹⁰ = 164010541 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (164011567) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 443090 + ... + 443459.

It is an arithmetic number, because the mean of its divisors is an integer number (25266675).

Almost surely, 2^164011565 is an apocalyptic number.

It is an amenable number.

164011565 is a deficient number, since it is larger than the sum of its proper divisors (38121835).

164011565 is an equidigital number, since it uses as much as digits as its factorization.

164011565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 886591.

The product of its (nonzero) digits is 3600, while the sum is 29.

The square root of 164011565 is about 12806.7000042946. The cubic root of 164011565 is about 547.3832337187.

The spelling of 164011565 in words is "one hundred sixty-four million, eleven thousand, five hundred sixty-five".