6605665659 has 24 divisors (see below), whose sum is σ = 9974016000. Its totient is φ = 4207759920.

The previous prime is 6605665631. The next prime is 6605665669. The reversal of 6605665659 is 9565665066.

It is not a de Polignac number, because 6605665659 - 2⁷ = 6605665531 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6605665669) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 127809 + ... + 171890.

It is an arithmetic number, because the mean of its divisors is an integer number (415584000).

Almost surely, 2^6605665659 is an apocalyptic number.

6605665659 is a deficient number, since it is larger than the sum of its proper divisors (3368350341).

6605665659 is a wasteful number, since it uses less digits than its factorization.

6605665659 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 299815 (or 299812 counting only the distinct ones).

The product of its (nonzero) digits is 8748000, while the sum is 54.

The square root of 6605665659 is about 81275.2462869231. The cubic root of 6605665659 is about 1876.3140450572.

The spelling of 6605665659 in words is "six billion, six hundred five million, six hundred sixty-five thousand, six hundred fifty-nine".