164491931978 has 16 divisors (see below), whose sum is σ = 269187183360. Its totient is φ = 74763902400.

The previous prime is 164491931971. The next prime is 164491932019. The reversal of 164491931978 is 879139194461.

164491931978 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 164491931978.

It is not an unprimeable number, because it can be changed into a prime (164491931971) 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 in 7 ways as a sum of consecutive naturals, for example, 78023 + ... + 578853.

It is an arithmetic number, because the mean of its divisors is an integer number (16824198960).

Almost surely, 2^164491931978 is an apocalyptic number.

164491931978 is a deficient number, since it is larger than the sum of its proper divisors (104695251382).

164491931978 is a wasteful number, since it uses less digits than its factorization.

164491931978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 515773.

The product of its digits is 11757312, while the sum is 62.

The spelling of 164491931978 in words is "one hundred sixty-four billion, four hundred ninety-one million, nine hundred thirty-one thousand, nine hundred seventy-eight".