5566550661 has 16 divisors (see below), whose sum is σ = 9424848000. Its totient is φ = 3180885984.

The previous prime is 5566550651. The next prime is 5566550677. The reversal of 5566550661 is 1660556655.

It is not a de Polignac number, because 5566550661 - 2⁹ = 5566550149 is a prime.

It is a super-2 number, since 2×5566550661² = 61972972522959073842, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5566550651) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14726136 + ... + 14726513.

It is an arithmetic number, because the mean of its divisors is an integer number (589053000).

Almost surely, 2^5566550661 is an apocalyptic number.

It is an amenable number.

5566550661 is a deficient number, since it is larger than the sum of its proper divisors (3858297339).

5566550661 is a wasteful number, since it uses less digits than its factorization.

5566550661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29452665 (or 29452659 counting only the distinct ones).

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

The square root of 5566550661 is about 74609.3202019694. The cubic root of 5566550661 is about 1772.2652496490.

The spelling of 5566550661 in words is "five billion, five hundred sixty-six million, five hundred fifty thousand, six hundred sixty-one".