15561105609 has 8 divisors (see below), whose sum is σ = 23712160960. Its totient is φ = 8892060336.

The previous prime is 15561105541. The next prime is 15561105661. The reversal of 15561105609 is 90650116551.

15561105609 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 15561105609 - 2⁹ = 15561105097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15561101609) 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 7 ways as a sum of consecutive naturals, for example, 370502494 + ... + 370502535.

It is an arithmetic number, because the mean of its divisors is an integer number (2964020120).

Almost surely, 2^15561105609 is an apocalyptic number.

It is an amenable number.

15561105609 is a deficient number, since it is larger than the sum of its proper divisors (8151055351).

15561105609 is an equidigital number, since it uses as much as digits as its factorization.

15561105609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 741005039.

The product of its (nonzero) digits is 40500, while the sum is 39.

The spelling of 15561105609 in words is "fifteen billion, five hundred sixty-one million, one hundred five thousand, six hundred nine".