91841055680 has 168 divisors, whose sum is σ = 253440352656. Its totient is φ = 31431884800.

The previous prime is 91841055659. The next prime is 91841055703. The reversal of 91841055680 is 8655014819.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 972140 + ... + 1062420.

Almost surely, 2^91841055680 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 91841055680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (126720176328).

91841055680 is an abundant number, since it is smaller than the sum of its proper divisors (161599296976).

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

91841055680 is a wasteful number, since it uses less digits than its factorization.

91841055680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90343 (or 90316 counting only the distinct ones).

The product of its (nonzero) digits is 345600, while the sum is 47.

The spelling of 91841055680 in words is "ninety-one billion, eight hundred forty-one million, fifty-five thousand, six hundred eighty".