164593681 has 16 divisors (see below), whose sum is σ = 197339904. Its totient is φ = 134221824.

The previous prime is 164593679. The next prime is 164593687. The reversal of 164593681 is 186395461.

It is a cyclic number.

It is not a de Polignac number, because 164593681 - 2¹ = 164593679 is a prime.

It is a super-2 number, since 2×164593681² = 54182159650259522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (164593687) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28425 + ... + 33721.

It is an arithmetic number, because the mean of its divisors is an integer number (12333744).

Almost surely, 2^164593681 is an apocalyptic number.

It is an amenable number.

164593681 is a deficient number, since it is larger than the sum of its proper divisors (32746223).

164593681 is a wasteful number, since it uses less digits than its factorization.

164593681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5520.

The product of its digits is 155520, while the sum is 43.

The square root of 164593681 is about 12829.4068841860. The cubic root of 164593681 is about 548.0300667699.

The spelling of 164593681 in words is "one hundred sixty-four million, five hundred ninety-three thousand, six hundred eighty-one".