6604664065 has 8 divisors (see below), whose sum is σ = 7928467560. Its totient is φ = 5281817472.

The previous prime is 6604664057. The next prime is 6604664069. The reversal of 6604664065 is 5604664066.

It can be written as a sum of positive squares in 4 ways, for example, as 389549169 + 6215114896 = 19737^2 + 78836^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 6604664065 - 2³ = 6604664057 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6604664069) 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, 223950 + ... + 251719.

It is an arithmetic number, because the mean of its divisors is an integer number (991058445).

Almost surely, 2^6604664065 is an apocalyptic number.

It is an amenable number.

6604664065 is a deficient number, since it is larger than the sum of its proper divisors (1323803495).

6604664065 is a wasteful number, since it uses less digits than its factorization.

6604664065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 478451.

The product of its (nonzero) digits is 622080, while the sum is 43.

The square root of 6604664065 is about 81269.0843125478. The cubic root of 6604664065 is about 1876.2192072831.

Subtracting from 6604664065 its reverse (5604664066), we obtain a palindrome (999999999).

The spelling of 6604664065 in words is "six billion, six hundred four million, six hundred sixty-four thousand, sixty-five".