15555610656 has 120 divisors (see below), whose sum is σ = 46328325120. Its totient is φ = 5119500672.

The previous prime is 15555610627. The next prime is 15555610703. The reversal of 15555610656 is 65601655551.

15555610656 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 19 ways as a sum of consecutive naturals, for example, 166785 + ... + 242751.

It is an arithmetic number, because the mean of its divisors is an integer number (386069376).

Almost surely, 2^15555610656 is an apocalyptic number.

15555610656 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 15555610656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23164162560).

15555610656 is an abundant number, since it is smaller than the sum of its proper divisors (30772714464).

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

15555610656 is an equidigital number, since it uses as much as digits as its factorization.

15555610656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76068 (or 76051 counting only the distinct ones).

The product of its (nonzero) digits is 675000, while the sum is 45.

The spelling of 15555610656 in words is "fifteen billion, five hundred fifty-five million, six hundred ten thousand, six hundred fifty-six".