164685911 has 8 divisors (see below), whose sum is σ = 185065440. Its totient is φ = 145408032.

The previous prime is 164685839. The next prime is 164685923. The reversal of 164685911 is 119586461.

164685911 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 164685911 - 2¹⁰ = 164684887 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 (164685611) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 275096 + ... + 275693.

It is an arithmetic number, because the mean of its divisors is an integer number (23133180).

Almost surely, 2^164685911 is an apocalyptic number.

164685911 is a deficient number, since it is larger than the sum of its proper divisors (20379529).

164685911 is a wasteful number, since it uses less digits than its factorization.

164685911 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 550825.

The product of its digits is 51840, while the sum is 41.

The square root of 164685911 is about 12833.0008571651. Note that the first 3 decimals coincide. The cubic root of 164685911 is about 548.1324104621.

The spelling of 164685911 in words is "one hundred sixty-four million, six hundred eighty-five thousand, nine hundred eleven".