664511231 has 12 divisors (see below), whose sum is σ = 699672960. Its totient is φ = 630728640.

The previous prime is 664511201. The next prime is 664511261. The reversal of 664511231 is 132115466.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (664511201) and next prime (664511261).

It is not a de Polignac number, because 664511231 - 2⁶ = 664511167 is a prime.

It is a super-2 number, since 2×664511231² = 883150352250270722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 664511194 and 664511203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664511201) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 50210 + ... + 62048.

It is an arithmetic number, because the mean of its divisors is an integer number (58306080).

Almost surely, 2^664511231 is an apocalyptic number.

664511231 is a deficient number, since it is larger than the sum of its proper divisors (35161729).

664511231 is a wasteful number, since it uses less digits than its factorization.

664511231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11954 (or 11917 counting only the distinct ones).

The product of its digits is 4320, while the sum is 29.

The square root of 664511231 is about 25778.1153500406. The cubic root of 664511231 is about 872.6379750217.

Adding to 664511231 its reverse (132115466), we get a palindrome (796626697).

The spelling of 664511231 in words is "six hundred sixty-four million, five hundred eleven thousand, two hundred thirty-one".