164491931917 has 2 divisors, whose sum is σ = 164491931918. Its totient is φ = 164491931916.

The previous prime is 164491931911. The next prime is 164491931927. The reversal of 164491931917 is 719139194461.

164491931917 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 164301326281 + 190605636 = 405341^2 + 13806^2 .

It is a cyclic number.

It is not a de Polignac number, because 164491931917 - 2¹⁹ = 164491407629 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (164491931911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82245965958 + 82245965959.

It is an arithmetic number, because the mean of its divisors is an integer number (82245965959).

Almost surely, 2^164491931917 is an apocalyptic number.

It is an amenable number.

164491931917 is a deficient number, since it is larger than the sum of its proper divisors (1).

164491931917 is an equidigital number, since it uses as much as digits as its factorization.

164491931917 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1469664, while the sum is 55.

The spelling of 164491931917 in words is "one hundred sixty-four billion, four hundred ninety-one million, nine hundred thirty-one thousand, nine hundred seventeen".