6600661600666 has 8 divisors (see below), whose sum is σ = 11315419886880. Its totient is φ = 2828854971708.

The previous prime is 6600661600597. The next prime is 6600661600669. The reversal of 6600661600666 is 6660061660066.

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

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 3 ways as a sum of consecutive naturals, for example, 235737914296 + ... + 235737914323.

It is an arithmetic number, because the mean of its divisors is an integer number (1414427485860).

Almost surely, 2^{6600661600666} is an apocalyptic number.

6600661600666 is a deficient number, since it is larger than the sum of its proper divisors (4714758286214).

6600661600666 is a wasteful number, since it uses less digits than its factorization.

6600661600666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 471475828628.

The product of its (nonzero) digits is 1679616, while the sum is 49.

The spelling of 6600661600666 in words is "six trillion, six hundred billion, six hundred sixty-one million, six hundred thousand, six hundred sixty-six".