5566661563 has 4 divisors (see below), whose sum is σ = 5758615440. Its totient is φ = 5374707688.

The previous prime is 5566661557. The next prime is 5566661627. The reversal of 5566661563 is 3651666655.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 5566661563 - 2⁵ = 5566661531 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (5566661533) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 95976895 + ... + 95976952.

It is an arithmetic number, because the mean of its divisors is an integer number (1439653860).

Almost surely, 2^5566661563 is an apocalyptic number.

5566661563 is a deficient number, since it is larger than the sum of its proper divisors (191953877).

5566661563 is a wasteful number, since it uses less digits than its factorization.

5566661563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 191953876.

The product of its digits is 2916000, while the sum is 49.

The square root of 5566661563 is about 74610.0634164052. The cubic root of 5566661563 is about 1772.2770191431.

The spelling of 5566661563 in words is "five billion, five hundred sixty-six million, six hundred sixty-one thousand, five hundred sixty-three".