8555966556 has 12 divisors (see below), whose sum is σ = 19963921992. Its totient is φ = 2851988848.

The previous prime is 8555966459. The next prime is 8555966579. The reversal of 8555966556 is 6556695558.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×8555966556² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 8555966556.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 356498595 + ... + 356498618.

It is an arithmetic number, because the mean of its divisors is an integer number (1663660166).

Almost surely, 2^8555966556 is an apocalyptic number.

It is an amenable number.

8555966556 is an abundant number, since it is smaller than the sum of its proper divisors (11407955436).

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

8555966556 is a wasteful number, since it uses less digits than its factorization.

8555966556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 712997220 (or 712997218 counting only the distinct ones).

The product of its digits is 48600000, while the sum is 60.

The square root of 8555966556 is about 92498.4678575813. The cubic root of 8555966556 is about 2045.2968968532.

The spelling of 8555966556 in words is "eight billion, five hundred fifty-five million, nine hundred sixty-six thousand, five hundred fifty-six".