91788553549 has 16 divisors (see below), whose sum is σ = 114744516480. Its totient is φ = 71331773760.

The previous prime is 91788553517. The next prime is 91788553567. The reversal of 91788553549 is 94535588719.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 91788553549 - 2⁵ = 91788553517 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91788553049) 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 15 ways as a sum of consecutive naturals, for example, 1569214 + ... + 1626655.

It is an arithmetic number, because the mean of its divisors is an integer number (7171532280).

Almost surely, 2^91788553549 is an apocalyptic number.

It is an amenable number.

91788553549 is a deficient number, since it is larger than the sum of its proper divisors (22955962931).

91788553549 is a wasteful number, since it uses less digits than its factorization.

91788553549 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3196260.

The product of its digits is 54432000, while the sum is 64.

The spelling of 91788553549 in words is "ninety-one billion, seven hundred eighty-eight million, five hundred fifty-three thousand, five hundred forty-nine".