164491931985 has 16 divisors (see below), whose sum is σ = 263192564736. Its totient is φ = 87727205888.

The previous prime is 164491931971. The next prime is 164491932019. The reversal of 164491931985 is 589139194461.

164491931985 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 164491931985 - 2⁵ = 164491931953 is a prime.

It is an unprimeable number.

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 in 15 ways as a sum of consecutive naturals, for example, 953872 + ... + 1113038.

It is an arithmetic number, because the mean of its divisors is an integer number (16449535296).

Almost surely, 2^164491931985 is an apocalyptic number.

164491931985 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

164491931985 is a deficient number, since it is larger than the sum of its proper divisors (98700632751).

164491931985 is a wasteful number, since it uses less digits than its factorization.

164491931985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 228072.

The product of its digits is 8398080, while the sum is 60.

The spelling of 164491931985 in words is "one hundred sixty-four billion, four hundred ninety-one million, nine hundred thirty-one thousand, nine hundred eighty-five".