664411531 has 6 divisors (see below), whose sum is σ = 772886940. Its totient is φ = 569495556.

The previous prime is 664411483. The next prime is 664411541. The reversal of 664411531 is 135114466.

It is not a de Polignac number, because 664411531 - 2⁷ = 664411403 is a prime.

It is a super-2 number, since 2×664411531² = 882885365051527922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 664411493 and 664411502.

It is not an unprimeable number, because it can be changed into a prime (664411541) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6779661 + ... + 6779758.

It is an arithmetic number, because the mean of its divisors is an integer number (128814490).

Almost surely, 2^664411531 is an apocalyptic number.

664411531 is a deficient number, since it is larger than the sum of its proper divisors (108475409).

664411531 is a wasteful number, since it uses less digits than its factorization.

664411531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13559433 (or 13559426 counting only the distinct ones).

The product of its digits is 8640, while the sum is 31.

The square root of 664411531 is about 25776.1814666176. The cubic root of 664411531 is about 872.5943307342.

Adding to 664411531 its reverse (135114466), we get a palindrome (799525997).

The spelling of 664411531 in words is "six hundred sixty-four million, four hundred eleven thousand, five hundred thirty-one".