5561643563 has 32 divisors (see below), whose sum is σ = 6688604160. Its totient is φ = 4525597440.

The previous prime is 5561643557. The next prime is 5561643631. The reversal of 5561643563 is 3653461655.

It is not a de Polignac number, because 5561643563 - 2¹⁰ = 5561642539 is a prime.

It is not an unprimeable number, because it can be changed into a prime (5561643523) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1930358 + ... + 1933236.

It is an arithmetic number, because the mean of its divisors is an integer number (209018880).

Almost surely, 2^5561643563 is an apocalyptic number.

5561643563 is a gapful number since it is divisible by the number (53) formed by its first and last digit.

5561643563 is a deficient number, since it is larger than the sum of its proper divisors (1126960597).

5561643563 is a wasteful number, since it uses less digits than its factorization.

5561643563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3107.

The product of its digits is 972000, while the sum is 44.

The square root of 5561643563 is about 74576.4276631698. The cubic root of 5561643563 is about 1771.7443264589.

The spelling of 5561643563 in words is "five billion, five hundred sixty-one million, six hundred forty-three thousand, five hundred sixty-three".