6516605556 has 36 divisors (see below), whose sum is σ = 16510093600. Its totient is φ = 2167248528.

The previous prime is 6516605551. The next prime is 6516605569. The reversal of 6516605556 is 6555066156.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×6516605556² = 84932295944980138272, which contains 22 as substring.

It is a congruent 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 11 ways as a sum of consecutive naturals, for example, 190366 + ... + 221973.

Almost surely, 2^6516605556 is an apocalyptic number.

It is an amenable number.

6516605556 is an abundant number, since it is smaller than the sum of its proper divisors (9993488044).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6516605556 is a wasteful number, since it uses less digits than its factorization.

6516605556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 412788 (or 412783 counting only the distinct ones).

The product of its (nonzero) digits is 810000, while the sum is 45.

The square root of 6516605556 is about 80725.4950805506. The cubic root of 6516605556 is about 1867.8434685967.

The spelling of 6516605556 in words is "six billion, five hundred sixteen million, six hundred five thousand, five hundred fifty-six".