55512566521555 has 16 divisors (see below), whose sum is σ = 78261072803424. Its totient is φ = 37267177524480.

The previous prime is 55512566521543. The next prime is 55512566521571.

55512566521555 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 55512566521555 - 2⁷ = 55512566521427 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 55512566521555.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 38819975874 + ... + 38819977303.

It is an arithmetic number, because the mean of its divisors is an integer number (4891317050214).

Almost surely, 2^{55512566521555} is an apocalyptic number.

55512566521555 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

55512566521555 is a deficient number, since it is larger than the sum of its proper divisors (22748506281869).

55512566521555 is a wasteful number, since it uses less digits than its factorization.

55512566521555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77639953206.

The product of its digits is 56250000, while the sum is 58.

The spelling of 55512566521555 in words is "fifty-five trillion, five hundred twelve billion, five hundred sixty-six million, five hundred twenty-one thousand, five hundred fifty-five".