6566655011556 has 48 divisors (see below), whose sum is σ = 15591955176000. Its totient is φ = 2150395754112.

The previous prime is 6566655011509. The next prime is 6566655011569. The reversal of 6566655011556 is 6551105566656.

It is a super-2 number, since 2×6566655011556² (a number of 26 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 6566655011496 and 6566655011505.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1897155 + ... + 4090538.

It is an arithmetic number, because the mean of its divisors is an integer number (324832399500).

Almost surely, 2^{6566655011556} is an apocalyptic number.

It is an amenable number.

6566655011556 is an abundant number, since it is smaller than the sum of its proper divisors (9025300164444).

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

6566655011556 is a wasteful number, since it uses less digits than its factorization.

6566655011556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5989308 (or 5989306 counting only the distinct ones).

The product of its (nonzero) digits is 24300000, while the sum is 57.

The spelling of 6566655011556 in words is "six trillion, five hundred sixty-six billion, six hundred fifty-five million, eleven thousand, five hundred fifty-six".