6605516566 has 24 divisors (see below), whose sum is σ = 11531562840. Its totient is φ = 2825887680.

The previous prime is 6605516537. The next prime is 6605516569. The reversal of 6605516566 is 6656155066.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6605516569) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 798696 + ... + 806923.

It is an arithmetic number, because the mean of its divisors is an integer number (480481785).

Almost surely, 2^6605516566 is an apocalyptic number.

6605516566 is a deficient number, since it is larger than the sum of its proper divisors (4926046274).

6605516566 is a wasteful number, since it uses less digits than its factorization.

6605516566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1605660 (or 1605649 counting only the distinct ones).

The product of its (nonzero) digits is 972000, while the sum is 46.

The square root of 6605516566 is about 81274.3290713618. The cubic root of 6605516566 is about 1876.2999285190.

It can be divided in two parts, 66055 and 16566, that added together give a triangular number (82621 = T₄₀₆).

The spelling of 6605516566 in words is "six billion, six hundred five million, five hundred sixteen thousand, five hundred sixty-six".