6516605555 has 4 divisors (see below), whose sum is σ = 7819926672. Its totient is φ = 5213284440.

The previous prime is 6516605551. The next prime is 6516605569. The reversal of 6516605555 is 5555066156.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 6516605555 - 2² = 6516605551 is a prime.

It is a super-2 number, since 2×6516605555² = 84932295918913716050, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6516605551) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 651660551 + ... + 651660560.

It is an arithmetic number, because the mean of its divisors is an integer number (1954981668).

Almost surely, 2^6516605555 is an apocalyptic number.

6516605555 is a deficient number, since it is larger than the sum of its proper divisors (1303321117).

6516605555 is a wasteful number, since it uses less digits than its factorization.

6516605555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1303321116.

The product of its (nonzero) digits is 675000, while the sum is 44.

The square root of 6516605555 is about 80725.4950743568. The cubic root of 6516605555 is about 1867.8434685012.

The spelling of 6516605555 in words is "six billion, five hundred sixteen million, six hundred five thousand, five hundred fifty-five".