991068874848 has 336 divisors, whose sum is σ = 3157778990016. Its totient is φ = 304234444800.

The previous prime is 991068874759. The next prime is 991068874877. The reversal of 991068874848 is 848478860199.

It is a happy number.

991068874848 is a `hidden beast` number, since 9 + 9 + 1 + 0 + 68 + 87 + 484 + 8 = 666.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 138588073 + ... + 138595223.

It is an arithmetic number, because the mean of its divisors is an integer number (9398151756).

Almost surely, 2^991068874848 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 991068874848, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1578889495008).

991068874848 is an abundant number, since it is smaller than the sum of its proper divisors (2166710115168).

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

991068874848 is a wasteful number, since it uses less digits than its factorization.

991068874848 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7649 (or 7626 counting only the distinct ones).

The product of its (nonzero) digits is 222953472, while the sum is 72.

The spelling of 991068874848 in words is "nine hundred ninety-one billion, sixty-eight million, eight hundred seventy-four thousand, eight hundred forty-eight".