15255115561 has 12 divisors (see below), whose sum is σ = 18679734480. Its totient is φ = 12387611880.

The previous prime is 15255115517. The next prime is 15255115571. The reversal of 15255115561 is 16551155251.

15255115561 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 15255115561 - 2⁹ = 15255115049 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 15255115561.

It is not an unprimeable number, because it can be changed into a prime (15255115571) 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 11 ways as a sum of consecutive naturals, for example, 8191935 + ... + 8193796.

It is an arithmetic number, because the mean of its divisors is an integer number (1556644540).

Almost surely, 2^15255115561 is an apocalyptic number.

It is an amenable number.

15255115561 is a deficient number, since it is larger than the sum of its proper divisors (3424618919).

15255115561 is a wasteful number, since it uses less digits than its factorization.

15255115561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16385764 (or 16385757 counting only the distinct ones).

The product of its digits is 37500, while the sum is 37.

It can be divided in two parts, 15255 and 115561, that added together give a triangular number (130816 = T₅₁₁).

The spelling of 15255115561 in words is "fifteen billion, two hundred fifty-five million, one hundred fifteen thousand, five hundred sixty-one".