91787017640016 has 320 divisors, whose sum is σ = 263621498572800. Its totient is φ = 27387931963392.

The previous prime is 91787017639979. The next prime is 91787017640027. The reversal of 91787017640016 is 61004671078719.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2040459861 + ... + 2040504843.

It is an arithmetic number, because the mean of its divisors is an integer number (823817183040).

Almost surely, 2^{91787017640016} 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 91787017640016, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (131810749286400).

91787017640016 is an abundant number, since it is smaller than the sum of its proper divisors (171834480932784).

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

91787017640016 is a wasteful number, since it uses less digits than its factorization.

91787017640016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46218 (or 46212 counting only the distinct ones).

The product of its (nonzero) digits is 3556224, while the sum is 57.

The spelling of 91787017640016 in words is "ninety-one trillion, seven hundred eighty-seven billion, seventeen million, six hundred forty thousand, sixteen".