164811685 has 16 divisors (see below), whose sum is σ = 210951216. Its totient is φ = 123179008.

The previous prime is 164811683. The next prime is 164811707. The reversal of 164811685 is 586118461.

It can be written as a sum of positive squares in 8 ways, for example, as 613089 + 164198596 = 783^2 + 12814^2 .

It is not a de Polignac number, because 164811685 - 2¹ = 164811683 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 (164811683) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4569 + ... + 18721.

It is an arithmetic number, because the mean of its divisors is an integer number (13184451).

Almost surely, 2^164811685 is an apocalyptic number.

It is an amenable number.

164811685 is a deficient number, since it is larger than the sum of its proper divisors (46139531).

164811685 is a wasteful number, since it uses less digits than its factorization.

164811685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14312.

The product of its digits is 46080, while the sum is 40.

The square root of 164811685 is about 12837.9003345563. The cubic root of 164811685 is about 548.2719149332.

The spelling of 164811685 in words is "one hundred sixty-four million, eight hundred eleven thousand, six hundred eighty-five".