5561556857 has 4 divisors (see below), whose sum is σ = 5577492900. Its totient is φ = 5545620816.

The previous prime is 5561556811. The next prime is 5561556863. The reversal of 5561556857 is 7586551655.

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

It can be written as a sum of positive squares in 2 ways, for example, as 4233974761 + 1327582096 = 65069^2 + 36436^2 .

It is a cyclic number.

It is not a de Polignac number, because 5561556857 - 2¹⁰ = 5561555833 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 5561556799 and 5561556808.

It is not an unprimeable number, because it can be changed into a prime (5561556887) 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, 7967498 + ... + 7968195.

It is an arithmetic number, because the mean of its divisors is an integer number (1394373225).

Almost surely, 2^5561556857 is an apocalyptic number.

It is an amenable number.

5561556857 is a deficient number, since it is larger than the sum of its proper divisors (15936043).

5561556857 is a wasteful number, since it uses less digits than its factorization.

5561556857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15936042.

The product of its digits is 6300000, while the sum is 53.

The square root of 5561556857 is about 74575.8463378056. The cubic root of 5561556857 is about 1771.7351192488.

The spelling of 5561556857 in words is "five billion, five hundred sixty-one million, five hundred fifty-six thousand, eight hundred fifty-seven".