8391491764992 has 288 divisors, whose sum is σ = 28364512780800. Its totient is φ = 2397198938112.

The previous prime is 8391491764969. The next prime is 8391491765003. The reversal of 8391491764992 is 2994671941938.

8391491764992 is a `hidden beast` number, since 8 + 3 + 9 + 1 + 491 + 7 + 6 + 49 + 92 = 666.

It is a tau number, because it is divible by the number of its divisors (288).

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 8391491764992.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 531200038 + ... + 531215834.

It is an arithmetic number, because the mean of its divisors is an integer number (98487891600).

Almost surely, 2^{8391491764992} 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 8391491764992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14182256390400).

8391491764992 is an abundant number, since it is smaller than the sum of its proper divisors (19973021015808).

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

8391491764992 is a wasteful number, since it uses less digits than its factorization.

8391491764992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26808 (or 26788 counting only the distinct ones).

The product of its digits is 211631616, while the sum is 72.

The spelling of 8391491764992 in words is "eight trillion, three hundred ninety-one billion, four hundred ninety-one million, seven hundred sixty-four thousand, nine hundred ninety-two".