91558047818 has 16 divisors (see below), whose sum is σ = 147927325920. Its totient is φ = 42361005456.

The previous prime is 91558047781. The next prime is 91558047839. The reversal of 91558047818 is 81874085519.

It is a super-2 number, since 2×91558047818² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28014905 + ... + 28018172.

It is an arithmetic number, because the mean of its divisors is an integer number (9245457870).

Almost surely, 2^91558047818 is an apocalyptic number.

91558047818 is a deficient number, since it is larger than the sum of its proper divisors (56369278102).

91558047818 is a wasteful number, since it uses less digits than its factorization.

91558047818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56033141.

The product of its (nonzero) digits is 3225600, while the sum is 56.

The spelling of 91558047818 in words is "ninety-one billion, five hundred fifty-eight million, forty-seven thousand, eight hundred eighteen".