164491931983 has 4 divisors (see below), whose sum is σ = 174167928000. Its totient is φ = 154815935968.

The previous prime is 164491931971. The next prime is 164491932019. The reversal of 164491931983 is 389139194461.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-164491931983 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 (164491931953) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4837997983 + ... + 4837998016.

It is an arithmetic number, because the mean of its divisors is an integer number (43541982000).

Almost surely, 2^164491931983 is an apocalyptic number.

164491931983 is a deficient number, since it is larger than the sum of its proper divisors (9675996017).

164491931983 is an equidigital number, since it uses as much as digits as its factorization.

164491931983 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9675996016.

The product of its digits is 5038848, while the sum is 58.

The spelling of 164491931983 in words is "one hundred sixty-four billion, four hundred ninety-one million, nine hundred thirty-one thousand, nine hundred eighty-three".