664122111 has 16 divisors (see below), whose sum is σ = 897845760. Its totient is φ = 436587840.

The previous prime is 664122097. The next prime is 664122133. The reversal of 664122111 is 111221466.

It is a happy number.

It is not a de Polignac number, because 664122111 - 2⁹ = 664121599 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664122211) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 276331 + ... + 278723.

It is an arithmetic number, because the mean of its divisors is an integer number (56115360).

Almost surely, 2^664122111 is an apocalyptic number.

664122111 is a deficient number, since it is larger than the sum of its proper divisors (233723649).

664122111 is a wasteful number, since it uses less digits than its factorization.

664122111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3646.

The product of its digits is 576, while the sum is 24.

The square root of 664122111 is about 25770.5667574464. The cubic root of 664122111 is about 872.4676106125.

Adding to 664122111 its reverse (111221466), we get a palindrome (775343577).

The spelling of 664122111 in words is "six hundred sixty-four million, one hundred twenty-two thousand, one hundred eleven".