556911217566 has 288 divisors, whose sum is σ = 1468520202240. Its totient is φ = 151783632000.

The previous prime is 556911217559. The next prime is 556911217591. The reversal of 556911217566 is 665712119655.

It is a happy number.

556911217566 is a `hidden beast` number, since 5 + 5 + 69 + 1 + 1 + 2 + 17 + 566 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 67986531 + ... + 67994721.

It is an arithmetic number, because the mean of its divisors is an integer number (5099028480).

Almost surely, 2^556911217566 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 556911217566, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (734260101120).

556911217566 is an abundant number, since it is smaller than the sum of its proper divisors (911608984674).

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

556911217566 is a wasteful number, since it uses less digits than its factorization.

556911217566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8324 (or 8310 counting only the distinct ones).

The product of its digits is 3402000, while the sum is 54.

It can be divided in two parts, 556911 and 217566, that added together give a palindrome (774477).

The spelling of 556911217566 in words is "five hundred fifty-six billion, nine hundred eleven million, two hundred seventeen thousand, five hundred sixty-six".