6605601666 has 16 divisors (see below), whose sum is σ = 13221468000. Its totient is φ = 2200156448.

The previous prime is 6605601647. The next prime is 6605601671. The reversal of 6605601666 is 6661065066.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 419316 + ... + 434783.

It is an arithmetic number, because the mean of its divisors is an integer number (826341750).

Almost surely, 2^6605601666 is an apocalyptic number.

6605601666 is an abundant number, since it is smaller than the sum of its proper divisors (6615866334).

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

6605601666 is a wasteful number, since it uses less digits than its factorization.

6605601666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 855393.

The product of its (nonzero) digits is 233280, while the sum is 42.

The square root of 6605601666 is about 81274.8526052185. The cubic root of 6605601666 is about 1876.3079860487.

The spelling of 6605601666 in words is "six billion, six hundred five million, six hundred one thousand, six hundred sixty-six".