15565565055887 has 32 divisors (see below), whose sum is σ = 19434915892224. Its totient is φ = 12111208588800.

The previous prime is 15565565055883. The next prime is 15565565055899. The reversal of 15565565055887 is 78855056556551.

It is a cyclic number.

It is not a de Polignac number, because 15565565055887 - 2² = 15565565055883 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 15565565055887.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15565565055883) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 268727453 + ... + 268785369.

It is an arithmetic number, because the mean of its divisors is an integer number (607341121632).

Almost surely, 2^{15565565055887} is an apocalyptic number.

15565565055887 is a deficient number, since it is larger than the sum of its proper divisors (3869350836337).

15565565055887 is a wasteful number, since it uses less digits than its factorization.

15565565055887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62999.

The product of its (nonzero) digits is 1260000000, while the sum is 71.

The spelling of 15565565055887 in words is "fifteen trillion, five hundred sixty-five billion, five hundred sixty-five million, fifty-five thousand, eight hundred eighty-seven".