91208216518 has 8 divisors (see below), whose sum is σ = 136860153120. Its totient is φ = 45588165480.

The previous prime is 91208216483. The next prime is 91208216551. The reversal of 91208216518 is 81561280219.

It is a sphenic number, since it is the product of 3 distinct primes.

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 3 ways as a sum of consecutive naturals, for example, 7964238 + ... + 7975681.

It is an arithmetic number, because the mean of its divisors is an integer number (17107519140).

Almost surely, 2^91208216518 is an apocalyptic number.

91208216518 is a deficient number, since it is larger than the sum of its proper divisors (45651936602).

91208216518 is a wasteful number, since it uses less digits than its factorization.

91208216518 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15942782.

The product of its (nonzero) digits is 69120, while the sum is 43.

The spelling of 91208216518 in words is "ninety-one billion, two hundred eight million, two hundred sixteen thousand, five hundred eighteen".