664504441 has 8 divisors (see below), whose sum is σ = 667995080. Its totient is φ = 661022208.

The previous prime is 664504429. The next prime is 664504453. The reversal of 664504441 is 144405466.

It is an interprime number because it is at equal distance from previous prime (664504429) and next prime (664504453).

It can be written as a sum of positive squares in 4 ways, for example, as 126450025 + 538054416 = 11245^2 + 23196^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-664504441 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 664504397 and 664504406.

It is not an unprimeable number, because it can be changed into a prime (664504411) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 208105 + ... + 211273.

It is an arithmetic number, because the mean of its divisors is an integer number (83499385).

Almost surely, 2^664504441 is an apocalyptic number.

It is an amenable number.

664504441 is a deficient number, since it is larger than the sum of its proper divisors (3490639).

664504441 is a wasteful number, since it uses less digits than its factorization.

664504441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4203.

The product of its (nonzero) digits is 46080, while the sum is 34.

The square root of 664504441 is about 25777.9836488427. The cubic root of 664504441 is about 872.6350027960.

The spelling of 664504441 in words is "six hundred sixty-four million, five hundred four thousand, four hundred forty-one".