91445690550 has 96 divisors (see below), whose sum is σ = 233029585152. Its totient is φ = 23714743680.

The previous prime is 91445690537. The next prime is 91445690561. The reversal of 91445690550 is 5509654419.

It is a self number, because there is not a number n which added to its sum of digits gives 91445690550.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 21348709 + ... + 21352991.

It is an arithmetic number, because the mean of its divisors is an integer number (2427391512).

Almost surely, 2^91445690550 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 91445690550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (116514792576).

91445690550 is an abundant number, since it is smaller than the sum of its proper divisors (141583894602).

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

91445690550 is a wasteful number, since it uses less digits than its factorization.

91445690550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8182 (or 8177 counting only the distinct ones).

The product of its (nonzero) digits is 972000, while the sum is 48.

The spelling of 91445690550 in words is "ninety-one billion, four hundred forty-five million, six hundred ninety thousand, five hundred fifty".