664004111 has 4 divisors (see below), whose sum is σ = 667672824. Its totient is φ = 660335400.

The previous prime is 664004101. The next prime is 664004119. The reversal of 664004111 is 111400466.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 664004111 - 2²² = 659809807 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 (664004119) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 1834085 + ... + 1834446.

It is an arithmetic number, because the mean of its divisors is an integer number (166918206).

Almost surely, 2^664004111 is an apocalyptic number.

664004111 is a deficient number, since it is larger than the sum of its proper divisors (3668713).

664004111 is a wasteful number, since it uses less digits than its factorization.

664004111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3668712.

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 664004111 is about 25768.2772221971. The cubic root of 664004111 is about 872.4159347363.

Adding to 664004111 its reverse (111400466), we get a palindrome (775404577).

The spelling of 664004111 in words is "six hundred sixty-four million, four thousand, one hundred eleven".