91818813097920 has 224 divisors, whose sum is σ = 296752651868160. Its totient is φ = 24049570406400.

The previous prime is 91818813097909. The next prime is 91818813097937. The reversal of 91818813097920 is 2979031881819.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9342969 + ... + 16459911.

Almost surely, 2^{91818813097920} 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 91818813097920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (148376325934080).

91818813097920 is an abundant number, since it is smaller than the sum of its proper divisors (204933838770240).

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

91818813097920 is a wasteful number, since it uses less digits than its factorization.

91818813097920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7117203 (or 7117193 counting only the distinct ones).

The product of its (nonzero) digits is 15676416, while the sum is 66.

The spelling of 91818813097920 in words is "ninety-one trillion, eight hundred eighteen billion, eight hundred thirteen million, ninety-seven thousand, nine hundred twenty".