5605505561 has 2 divisors, whose sum is σ = 5605505562. Its totient is φ = 5605505560.

The previous prime is 5605505551. The next prime is 5605505573. The reversal of 5605505561 is 1655055065.

5605505561 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5604019600 + 1485961 = 74860^2 + 1219^2 .

It is a cyclic number.

It is not a de Polignac number, because 5605505561 - 2¹⁴ = 5605489177 is a prime.

It is not a weakly prime, because it can be changed into another prime (5605505551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2802752780 + 2802752781.

It is an arithmetic number, because the mean of its divisors is an integer number (2802752781).

Almost surely, 2^5605505561 is an apocalyptic number.

It is an amenable number.

5605505561 is a deficient number, since it is larger than the sum of its proper divisors (1).

5605505561 is an equidigital number, since it uses as much as digits as its factorization.

5605505561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 112500, while the sum is 38.

The square root of 5605505561 is about 74869.9242753724. The cubic root of 5605505561 is about 1776.3897664052.

The spelling of 5605505561 in words is "five billion, six hundred five million, five hundred five thousand, five hundred sixty-one".