664560441 has 12 divisors (see below), whose sum is σ = 985864932. Its totient is φ = 431066016.

The previous prime is 664560427. The next prime is 664560451. The reversal of 664560441 is 144065466.

664560441 is a `hidden beast` number, since 6 + 6 + 4 + 5 + 604 + 41 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 595604025 + 68956416 = 24405^2 + 8304^2 .

It is not a de Polignac number, because 664560441 - 2⁵ = 664560409 is a prime.

It is a super-2 number, since 2×664560441² = 883281159484228962, which contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 664560396 and 664560405.

It is not an unprimeable number, because it can be changed into a prime (664560451) 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, 997506 + ... + 998171.

It is an arithmetic number, because the mean of its divisors is an integer number (82155411).

Almost surely, 2^664560441 is an apocalyptic number.

It is an amenable number.

664560441 is a deficient number, since it is larger than the sum of its proper divisors (321304491).

664560441 is a wasteful number, since it uses less digits than its factorization.

664560441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1995720 (or 1995717 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 36.

The square root of 664560441 is about 25779.0698241810. The cubic root of 664560441 is about 872.6595153924.

The spelling of 664560441 in words is "six hundred sixty-four million, five hundred sixty thousand, four hundred forty-one".