91445881518 has 12 divisors (see below), whose sum is σ = 198132743328. Its totient is φ = 30481960500.

The previous prime is 91445881487. The next prime is 91445881519. The reversal of 91445881518 is 81518854419.

91445881518 is a `hidden beast` number, since 9 + 1 + 4 + 4 + 588 + 1 + 51 + 8 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91445881519) 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 5 ways as a sum of consecutive naturals, for example, 2540163358 + ... + 2540163393.

It is an arithmetic number, because the mean of its divisors is an integer number (16511061944).

Almost surely, 2^91445881518 is an apocalyptic number.

91445881518 is an abundant number, since it is smaller than the sum of its proper divisors (106686861810).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

91445881518 is a wasteful number, since it uses less digits than its factorization.

91445881518 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5080326759 (or 5080326756 counting only the distinct ones).

The product of its digits is 1843200, while the sum is 54.

The spelling of 91445881518 in words is "ninety-one billion, four hundred forty-five million, eight hundred eighty-one thousand, five hundred eighteen".