91005505055 has 4 divisors (see below), whose sum is σ = 109206606072. Its totient is φ = 72804404040.

The previous prime is 91005505039. The next prime is 91005505057. The reversal of 91005505055 is 55050550019.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 91005505055 - 2⁴ = 91005505039 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91005505057) 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 3 ways as a sum of consecutive naturals, for example, 9100550501 + ... + 9100550510.

It is an arithmetic number, because the mean of its divisors is an integer number (27301651518).

Almost surely, 2^91005505055 is an apocalyptic number.

91005505055 is a deficient number, since it is larger than the sum of its proper divisors (18201101017).

91005505055 is a wasteful number, since it uses less digits than its factorization.

91005505055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18201101016.

The product of its (nonzero) digits is 28125, while the sum is 35.

It can be divided in two parts, 9100 and 5505055, that added together give a palindrome (5514155).

The spelling of 91005505055 in words is "ninety-one billion, five million, five hundred five thousand, fifty-five".