91751871880 has 16 divisors (see below), whose sum is σ = 206441711820. Its totient is φ = 36700748736.

The previous prime is 91751871863. The next prime is 91751871943. The reversal of 91751871880 is 8817815719.

It can be written as a sum of positive squares in 2 ways, for example, as 85836108484 + 5915763396 = 292978^2 + 76914^2 .

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 1146898359 + ... + 1146898438.

Almost surely, 2^91751871880 is an apocalyptic number.

It is an amenable number.

91751871880 is an abundant number, since it is smaller than the sum of its proper divisors (114689839940).

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

91751871880 is a wasteful number, since it uses less digits than its factorization.

91751871880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2293796808 (or 2293796804 counting only the distinct ones).

The product of its (nonzero) digits is 1128960, while the sum is 55.

The spelling of 91751871880 in words is "ninety-one billion, seven hundred fifty-one million, eight hundred seventy-one thousand, eight hundred eighty".