5561947918 has 16 divisors (see below), whose sum is σ = 8539104816. Its totient is φ = 2715612480.

The previous prime is 5561947907. The next prime is 5561947921. The reversal of 5561947918 is 8197491655.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 567298 + ... + 577018.

It is an arithmetic number, because the mean of its divisors is an integer number (533694051).

Almost surely, 2^5561947918 is an apocalyptic number.

5561947918 is a deficient number, since it is larger than the sum of its proper divisors (2977156898).

5561947918 is a wasteful number, since it uses less digits than its factorization.

5561947918 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16419.

The product of its digits is 2721600, while the sum is 55.

The square root of 5561947918 is about 74578.4681929040. The cubic root of 5561947918 is about 1771.7766448076.

The spelling of 5561947918 in words is "five billion, five hundred sixty-one million, nine hundred forty-seven thousand, nine hundred eighteen".