91799242778880 has 1728 divisors, whose sum is σ = 393994684661760. Its totient is φ = 19216598630400.

The previous prime is 91799242778879. The next prime is 91799242778899. The reversal of 91799242778880 is 8887724299719.

91799242778880 is a `hidden beast` number, since 9 + 179 + 9 + 24 + 277 + 88 + 80 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 91799242778880.

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 88353457401 + ... + 88353458439.

Almost surely, 2^{91799242778880} is an apocalyptic number.

91799242778880 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 91799242778880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (196997342330880).

91799242778880 is an abundant number, since it is smaller than the sum of its proper divisors (302195441882880).

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

91799242778880 is a wasteful number, since it uses less digits than its factorization.

91799242778880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1668 (or 1651 counting only the distinct ones).

The product of its (nonzero) digits is 2048385024, while the sum is 81.

The spelling of 91799242778880 in words is "ninety-one trillion, seven hundred ninety-nine billion, two hundred forty-two million, seven hundred seventy-eight thousand, eight hundred eighty".