15556506550 has 96 divisors (see below), whose sum is σ = 32701032000. Its totient is φ = 5462899200.

The previous prime is 15556506541. The next prime is 15556506571. The reversal of 15556506550 is 5560565551.

It is a junction number, because it is equal to n+sod(n) for n = 15556506497 and 15556506506.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2703076 + ... + 2708824.

It is an arithmetic number, because the mean of its divisors is an integer number (340635750).

Almost surely, 2^15556506550 is an apocalyptic number.

15556506550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

15556506550 is an abundant number, since it is smaller than the sum of its proper divisors (17144525450).

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

15556506550 is a wasteful number, since it uses less digits than its factorization.

15556506550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5978 (or 5973 counting only the distinct ones).

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

The spelling of 15556506550 in words is "fifteen billion, five hundred fifty-six million, five hundred six thousand, five hundred fifty".