6600661600665 has 32 divisors (see below), whose sum is σ = 11789088638976. Its totient is φ = 3125894708160.

The previous prime is 6600661600597. The next prime is 6600661600669. The reversal of 6600661600665 is 5660061660066.

It is not a de Polignac number, because 6600661600665 - 2⁹ = 6600661600153 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6600661600669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 465155809 + ... + 465169998.

It is an arithmetic number, because the mean of its divisors is an integer number (368409019968).

Almost surely, 2^{6600661600665} is an apocalyptic number.

It is an amenable number.

6600661600665 is a deficient number, since it is larger than the sum of its proper divisors (5188427038311).

6600661600665 is a wasteful number, since it uses less digits than its factorization.

6600661600665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 930325869.

The product of its (nonzero) digits is 1399680, while the sum is 48.

The spelling of 6600661600665 in words is "six trillion, six hundred billion, six hundred sixty-one million, six hundred thousand, six hundred sixty-five".