5565659861 has 2 divisors, whose sum is σ = 5565659862. Its totient is φ = 5565659860.

The previous prime is 5565659849. The next prime is 5565659933. The reversal of 5565659861 is 1689565655.

5565659861 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., 4220970961 + 1344688900 = 64969^2 + 36670^2 .

It is a cyclic number.

It is not a de Polignac number, because 5565659861 - 2²² = 5561465557 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 5565659797 and 5565659806.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5565659821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2782829930 + 2782829931.

It is an arithmetic number, because the mean of its divisors is an integer number (2782829931).

Almost surely, 2^5565659861 is an apocalyptic number.

It is an amenable number.

5565659861 is a deficient number, since it is larger than the sum of its proper divisors (1).

5565659861 is an equidigital number, since it uses as much as digits as its factorization.

5565659861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9720000, while the sum is 56.

The square root of 5565659861 is about 74603.3501995721. The cubic root of 5565659861 is about 1772.1707076725.

The spelling of 5565659861 in words is "five billion, five hundred sixty-five million, six hundred fifty-nine thousand, eight hundred sixty-one".