164644885 has 4 divisors (see below), whose sum is σ = 197573868. Its totient is φ = 131715904.

The previous prime is 164644867. The next prime is 164644891. The reversal of 164644885 is 588446461.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 588446461 = 67 ⋅8782783.

It can be written as a sum of positive squares in 2 ways, for example, as 49533444 + 115111441 = 7038^2 + 10729^2 .

It is a cyclic number.

It is not a de Polignac number, because 164644885 - 2⁵ = 164644853 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16464484 + ... + 16464493.

It is an arithmetic number, because the mean of its divisors is an integer number (49393467).

Almost surely, 2^164644885 is an apocalyptic number.

It is an amenable number.

164644885 is a deficient number, since it is larger than the sum of its proper divisors (32928983).

164644885 is an equidigital number, since it uses as much as digits as its factorization.

164644885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32928982.

The product of its digits is 737280, while the sum is 46.

The square root of 164644885 is about 12831.4023006061. The cubic root of 164644885 is about 548.0868903814.

The spelling of 164644885 in words is "one hundred sixty-four million, six hundred forty-four thousand, eight hundred eighty-five".