6515605666 has 16 divisors (see below), whose sum is σ = 10322928000. Its totient is φ = 3075800688.

The previous prime is 6515605633. The next prime is 6515605667. The reversal of 6515605666 is 6665065156.

It is a super-2 number, since 2×6515605666² = 84906234389622607112, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (6515605667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 281466 + ... + 303733.

It is an arithmetic number, because the mean of its divisors is an integer number (645183000).

Almost surely, 2^6515605666 is an apocalyptic number.

6515605666 is a deficient number, since it is larger than the sum of its proper divisors (3807322334).

6515605666 is a wasteful number, since it uses less digits than its factorization.

6515605666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 585513.

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

The square root of 6515605666 is about 80719.3016942045. The cubic root of 6515605666 is about 1867.7479314586.

The spelling of 6515605666 in words is "six billion, five hundred fifteen million, six hundred five thousand, six hundred sixty-six".