5966561556 has 18 divisors (see below), whose sum is σ = 15082141802. Its totient is φ = 1988853840.

The previous prime is 5966561551. The next prime is 5966561569. The reversal of 5966561556 is 6551656695.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 4207597956 + 1758963600 = 64866^2 + 41940^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a super-2 number, since 2×5966561556² = 71199713603074282272, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5966561551) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 82868875 + ... + 82868946.

Almost surely, 2^5966561556 is an apocalyptic number.

It is an amenable number.

5966561556 is an abundant number, since it is smaller than the sum of its proper divisors (9115580246).

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

5966561556 is a wasteful number, since it uses less digits than its factorization.

5966561556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165737831 (or 165737826 counting only the distinct ones).

The product of its digits is 7290000, while the sum is 54.

The square root of 5966561556 is about 77243.5211263702. The cubic root of 5966561556 is about 1813.7386532529.

The spelling of 5966561556 in words is "five billion, nine hundred sixty-six million, five hundred sixty-one thousand, five hundred fifty-six".