91745140808 has 8 divisors (see below), whose sum is σ = 172022139030. Its totient is φ = 45872570400.

The previous prime is 91745140789. The next prime is 91745140901. The reversal of 91745140808 is 80804154719.

It can be written as a sum of positive squares in only one way, i.e., 91265618404 + 479522404 = 302102^2 + 21898^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5734071293 + ... + 5734071308.

Almost surely, 2^91745140808 is an apocalyptic number.

It is an amenable number.

91745140808 is a deficient number, since it is larger than the sum of its proper divisors (80276998222).

91745140808 is a wasteful number, since it uses less digits than its factorization.

91745140808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11468142607 (or 11468142603 counting only the distinct ones).

The product of its (nonzero) digits is 322560, while the sum is 47.

The spelling of 91745140808 in words is "ninety-one billion, seven hundred forty-five million, one hundred forty thousand, eight hundred eight".