6604664066 has 32 divisors (see below), whose sum is σ = 13301705088. Its totient is φ = 2375303040.

The previous prime is 6604664057. The next prime is 6604664069.

6604664066 is nontrivially palindromic in base 10.

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

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 15 ways as a sum of consecutive naturals, for example, 1647515 + ... + 1651518.

It is an arithmetic number, because the mean of its divisors is an integer number (415678284).

Almost surely, 2^6604664066 is an apocalyptic number.

6604664066 is an abundant number, since it is smaller than the sum of its proper divisors (6697041022).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6604664066 is a wasteful number, since it uses less digits than its factorization.

6604664066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3299066.

The product of its (nonzero) digits is 746496, while the sum is 44.

The square root of 6604664066 is about 81269.0843187002. The cubic root of 6604664066 is about 1876.2192073778.

The spelling of 6604664066 in words is "six billion, six hundred four million, six hundred sixty-four thousand, sixty-six".