5566001561 has 2 divisors, whose sum is σ = 5566001562. Its totient is φ = 5566001560.

The previous prime is 5566001549. The next prime is 5566001579. The reversal of 5566001561 is 1651006655.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4928742025 + 637259536 = 70205^2 + 25244^2 .

It is a cyclic number.

It is not a de Polignac number, because 5566001561 - 2¹⁴ = 5565985177 is a prime.

It is not a weakly prime, because it can be changed into another prime (5566003561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2783000780 + 2783000781.

It is an arithmetic number, because the mean of its divisors is an integer number (2783000781).

Almost surely, 2^5566001561 is an apocalyptic number.

It is an amenable number.

5566001561 is a deficient number, since it is larger than the sum of its proper divisors (1).

5566001561 is an equidigital number, since it uses as much as digits as its factorization.

5566001561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27000, while the sum is 35.

The square root of 5566001561 is about 74605.6402760542. The cubic root of 5566001561 is about 1772.2069740125.

The spelling of 5566001561 in words is "five billion, five hundred sixty-six million, one thousand, five hundred sixty-one".