91768843549 has 24 divisors (see below), whose sum is σ = 96556561920. Its totient is φ = 87113426400.

The previous prime is 91768843499. The next prime is 91768843577. The reversal of 91768843549 is 94534886719.

It is not a de Polignac number, because 91768843549 - 2²³ = 91760454941 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91768843949) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 49047084 + ... + 49048954.

It is an arithmetic number, because the mean of its divisors is an integer number (4023190080).

Almost surely, 2^91768843549 is an apocalyptic number.

It is an amenable number.

91768843549 is a deficient number, since it is larger than the sum of its proper divisors (4787718371).

91768843549 is a wasteful number, since it uses less digits than its factorization.

91768843549 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2329 (or 2250 counting only the distinct ones).

The product of its digits is 52254720, while the sum is 64.

The spelling of 91768843549 in words is "ninety-one billion, seven hundred sixty-eight million, eight hundred forty-three thousand, five hundred forty-nine".