91517868792 has 192 divisors, whose sum is σ = 299758368000. Its totient is φ = 26147772000.

The previous prime is 91517868763. The next prime is 91517868797. The reversal of 91517868792 is 29786871519.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91517868797) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 598167 + ... + 735417.

It is an arithmetic number, because the mean of its divisors is an integer number (1561241500).

Almost surely, 2^91517868792 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 91517868792, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (149879184000).

91517868792 is an abundant number, since it is smaller than the sum of its proper divisors (208240499208).

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

91517868792 is a wasteful number, since it uses less digits than its factorization.

91517868792 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137293 (or 137263 counting only the distinct ones).

The product of its digits is 15240960, while the sum is 63.

The spelling of 91517868792 in words is "ninety-one billion, five hundred seventeen million, eight hundred sixty-eight thousand, seven hundred ninety-two".