5561381857 has 2 divisors, whose sum is σ = 5561381858. Its totient is φ = 5561381856.

The previous prime is 5561381851. The next prime is 5561381867. The reversal of 5561381857 is 7581831655.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4446089041 + 1115292816 = 66679^2 + 33396^2 .

It is a cyclic number.

It is not a de Polignac number, because 5561381857 - 2¹¹ = 5561379809 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 5561381857.

It is not a weakly prime, because it can be changed into another prime (5561381851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2780690928 + 2780690929.

It is an arithmetic number, because the mean of its divisors is an integer number (2780690929).

Almost surely, 2^5561381857 is an apocalyptic number.

It is an amenable number.

5561381857 is a deficient number, since it is larger than the sum of its proper divisors (1).

5561381857 is an equidigital number, since it uses as much as digits as its factorization.

5561381857 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1008000, while the sum is 49.

The square root of 5561381857 is about 74574.6730264371. The cubic root of 5561381857 is about 1771.7165359093.

The spelling of 5561381857 in words is "five billion, five hundred sixty-one million, three hundred eighty-one thousand, eight hundred fifty-seven".