5661606105509 has 16 divisors (see below), whose sum is σ = 5975887104000. Its totient is φ = 5348970532080.

The previous prime is 5661606105497. The next prime is 5661606105521. The reversal of 5661606105509 is 9055016061665.

It is a happy number.

5661606105509 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (5661606105497) and next prime (5661606105521).

It is a cyclic number.

It is not a de Polignac number, because 5661606105509 - 2³⁶ = 5592886628773 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5661606105599) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13213562 + ... + 13635300.

It is an arithmetic number, because the mean of its divisors is an integer number (373492944000).

Almost surely, 2^{5661606105509} is an apocalyptic number.

It is an amenable number.

5661606105509 is a deficient number, since it is larger than the sum of its proper divisors (314280998491).

5661606105509 is a wasteful number, since it uses less digits than its factorization.

5661606105509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 423688.

The product of its (nonzero) digits is 1458000, while the sum is 50.

The spelling of 5661606105509 in words is "five trillion, six hundred sixty-one billion, six hundred six million, one hundred five thousand, five hundred nine".