6555666515 has 16 divisors (see below), whose sum is σ = 7915244832. Its totient is φ = 5212295424.

The previous prime is 6555666499. The next prime is 6555666569. The reversal of 6555666515 is 5156665556.

It is a cyclic number.

It is not a de Polignac number, because 6555666515 - 2⁴ = 6555666499 is a prime.

It is a Duffinian number.

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 15 ways as a sum of consecutive naturals, for example, 1077512 + ... + 1083578.

It is an arithmetic number, because the mean of its divisors is an integer number (494702802).

Almost surely, 2^6555666515 is an apocalyptic number.

6555666515 is a deficient number, since it is larger than the sum of its proper divisors (1359578317).

6555666515 is a wasteful number, since it uses less digits than its factorization.

6555666515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7366.

The product of its digits is 4050000, while the sum is 50.

The square root of 6555666515 is about 80967.0705595800. The cubic root of 6555666515 is about 1871.5680286121.

The spelling of 6555666515 in words is "six billion, five hundred fifty-five million, six hundred sixty-six thousand, five hundred fifteen".