164685805 has 8 divisors (see below), whose sum is σ = 197766144. Its totient is φ = 131653200.

The previous prime is 164685767. The next prime is 164685821. The reversal of 164685805 is 508586461.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 164685805 - 2²¹ = 162588653 is a prime.

It is a Duffinian number.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 3841 + ... + 18550.

It is an arithmetic number, because the mean of its divisors is an integer number (24720768).

Almost surely, 2^164685805 is an apocalyptic number.

It is an amenable number.

164685805 is a deficient number, since it is larger than the sum of its proper divisors (33080339).

164685805 is a wasteful number, since it uses less digits than its factorization.

164685805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23867.

The product of its (nonzero) digits is 230400, while the sum is 43.

The square root of 164685805 is about 12832.9967271873. The cubic root of 164685805 is about 548.1322928603.

The spelling of 164685805 in words is "one hundred sixty-four million, six hundred eighty-five thousand, eight hundred five".