91000099000018 has 48 divisors (see below), whose sum is σ = 148956504633216. Its totient is φ = 41448337575840.

The previous prime is 91000099000007. The next prime is 91000099000043. The reversal of 91000099000018 is 81000099000019.

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 23 ways as a sum of consecutive naturals, for example, 337865463 + ... + 338134693.

It is an arithmetic number, because the mean of its divisors is an integer number (3103260513192).

Almost surely, 2^{91000099000018} is an apocalyptic number.

91000099000018 is a deficient number, since it is larger than the sum of its proper divisors (57956405633198).

91000099000018 is a wasteful number, since it uses less digits than its factorization.

91000099000018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 271487 (or 271408 counting only the distinct ones).

The product of its (nonzero) digits is 5832, while the sum is 37.

Subtracting from 91000099000018 its reverse (81000099000019), we obtain a palindrome (9999999999999).

The spelling of 91000099000018 in words is "ninety-one trillion, ninety-nine million, eighteen", and thus it is an aban number and an uban number.