15550661809 has 16 divisors (see below), whose sum is σ = 16078487040. Its totient is φ = 15028796160.

The previous prime is 15550661803. The next prime is 15550661831. The reversal of 15550661809 is 90816605551.

15550661809 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 15550661809 - 2⁹ = 15550661297 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15550661803) 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, 4627872 + ... + 4631230.

It is an arithmetic number, because the mean of its divisors is an integer number (1004905440).

Almost surely, 2^15550661809 is an apocalyptic number.

It is an amenable number.

15550661809 is a deficient number, since it is larger than the sum of its proper divisors (527825231).

15550661809 is a wasteful number, since it uses less digits than its factorization.

15550661809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4200.

The product of its (nonzero) digits is 324000, while the sum is 46.

The spelling of 15550661809 in words is "fifteen billion, five hundred fifty million, six hundred sixty-one thousand, eight hundred nine".