15561716056 has 8 divisors (see below), whose sum is σ = 29178217620. Its totient is φ = 7780858024.

The previous prime is 15561716011. The next prime is 15561716057. The reversal of 15561716056 is 65061716551.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15561716057) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 972607246 + ... + 972607261.

Almost surely, 2^15561716056 is an apocalyptic number.

It is an amenable number.

15561716056 is a deficient number, since it is larger than the sum of its proper divisors (13616501564).

15561716056 is a wasteful number, since it uses less digits than its factorization.

15561716056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1945214513 (or 1945214509 counting only the distinct ones).

The product of its (nonzero) digits is 189000, while the sum is 43.

The spelling of 15561716056 in words is "fifteen billion, five hundred sixty-one million, seven hundred sixteen thousand, fifty-six".