164491931971 has 2 divisors, whose sum is σ = 164491931972. Its totient is φ = 164491931970.

The previous prime is 164491931959. The next prime is 164491932019. The reversal of 164491931971 is 179139194461.

164491931971 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 is a cyclic number.

It is not a de Polignac number, because 164491931971 - 2¹⁹ = 164491407683 is a prime.

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, 82245965985 + 82245965986.

It is an arithmetic number, because the mean of its divisors is an integer number (82245965986).

Almost surely, 2^164491931971 is an apocalyptic number.

164491931971 is a deficient number, since it is larger than the sum of its proper divisors (1).

164491931971 is an equidigital number, since it uses as much as digits as its factorization.

164491931971 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 164491931971 in words is "one hundred sixty-four billion, four hundred ninety-one million, nine hundred thirty-one thousand, nine hundred seventy-one".