164178178920 has 144 divisors (see below), whose sum is σ = 620694100260. Its totient is φ = 37526436864.

The previous prime is 164178178909. The next prime is 164178178949. The reversal of 164178178920 is 29871871461.

It can be written as a sum of positive squares in 2 ways, for example, as 142852249764 + 21325929156 = 377958^2 + 146034^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 4635937 + ... + 4671216.

Almost surely, 2^164178178920 is an apocalyptic number.

164178178920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

164178178920 is an abundant number, since it is smaller than the sum of its proper divisors (456515921340).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

164178178920 is a wasteful number, since it uses less digits than its factorization.

164178178920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9307184 (or 9307170 counting only the distinct ones).

The product of its (nonzero) digits is 1354752, while the sum is 54.

The spelling of 164178178920 in words is "one hundred sixty-four billion, one hundred seventy-eight million, one hundred seventy-eight thousand, nine hundred twenty".