15505566550 has 96 divisors (see below), whose sum is σ = 32929454880. Its totient is φ = 5395046400.

The previous prime is 15505566529. The next prime is 15505566563. The reversal of 15505566550 is 5566550551.

15505566550 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 15505566497 and 15505566506.

It is a congruent number.

It is an unprimeable number.

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 47 ways as a sum of consecutive naturals, for example, 650442 + ... + 673858.

It is an arithmetic number, because the mean of its divisors is an integer number (343015155).

Almost surely, 2^15505566550 is an apocalyptic number.

15505566550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

15505566550 is an abundant number, since it is smaller than the sum of its proper divisors (17423888330).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

15505566550 is a wasteful number, since it uses less digits than its factorization.

15505566550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23506 (or 23501 counting only the distinct ones).

The product of its (nonzero) digits is 562500, while the sum is 43.

The spelling of 15505566550 in words is "fifteen billion, five hundred five million, five hundred sixty-six thousand, five hundred fifty".