91909205744 has 20 divisors (see below), whose sum is σ = 178707810480. Its totient is φ = 45791061120.

The previous prime is 91909205741. The next prime is 91909205803. The reversal of 91909205744 is 44750290919.

It is a junction number, because it is equal to n+sod(n) for n = 91909205692 and 91909205701.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91909205741) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10216724 + ... + 10225715.

It is an arithmetic number, because the mean of its divisors is an integer number (8935390524).

Almost surely, 2^91909205744 is an apocalyptic number.

It is an amenable number.

91909205744 is a deficient number, since it is larger than the sum of its proper divisors (86798604736).

91909205744 is a wasteful number, since it uses less digits than its factorization.

91909205744 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20442728 (or 20442722 counting only the distinct ones).

The product of its (nonzero) digits is 816480, while the sum is 50.

The spelling of 91909205744 in words is "ninety-one billion, nine hundred nine million, two hundred five thousand, seven hundred forty-four".