15505116655566 has 32 divisors (see below), whose sum is σ = 31045615388928. Its totient is φ = 5162477155200.

The previous prime is 15505116655541. The next prime is 15505116655573. The reversal of 15505116655566 is 66555661150551.

It is a Smith number, since the sum of its digits (57) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

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 15 ways as a sum of consecutive naturals, for example, 31974630 + ... + 32455926.

It is an arithmetic number, because the mean of its divisors is an integer number (970175480904).

Almost surely, 2^{15505116655566} is an apocalyptic number.

15505116655566 is an abundant number, since it is smaller than the sum of its proper divisors (15540498733362).

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

15505116655566 is a wasteful number, since it uses less digits than its factorization.

15505116655566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 487416.

The product of its (nonzero) digits is 20250000, while the sum is 57.

The spelling of 15505116655566 in words is "fifteen trillion, five hundred five billion, one hundred sixteen million, six hundred fifty-five thousand, five hundred sixty-six".