55591619555 has 32 divisors (see below), whose sum is σ = 69243902784. Its totient is φ = 42824871936.

The previous prime is 55591619549. The next prime is 55591619557.

55591619555 is nontrivially palindromic in base 10.

It is a cyclic number.

It is not a de Polignac number, because 55591619555 - 2⁶ = 55591619491 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 55591619555.

It is not an unprimeable number, because it can be changed into a prime (55591619557) 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 in 31 ways as a sum of consecutive naturals, for example, 2753357 + ... + 2773473.

It is an arithmetic number, because the mean of its divisors is an integer number (2163871962).

Almost surely, 2^55591619555 is an apocalyptic number.

55591619555 is a deficient number, since it is larger than the sum of its proper divisors (13652283229).

55591619555 is a wasteful number, since it uses less digits than its factorization.

55591619555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20375.

The product of its digits is 7593750, while the sum is 56.

The spelling of 55591619555 in words is "fifty-five billion, five hundred ninety-one million, six hundred nineteen thousand, five hundred fifty-five".