991350833312 has 576 divisors, whose sum is σ = 2553335447040. Its totient is φ = 370189467648.

The previous prime is 991350833311. The next prime is 991350833329. The reversal of 991350833312 is 213338053199.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (991350833311) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 8773016168 + ... + 8773016280.

It is an arithmetic number, because the mean of its divisors is an integer number (4432874040).

Almost surely, 2^991350833312 is an apocalyptic number.

991350833312 is a gapful number since it is divisible by the number (92) 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 991350833312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1276667723520).

991350833312 is an abundant number, since it is smaller than the sum of its proper divisors (1561984613728).

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

991350833312 is a wasteful number, since it uses less digits than its factorization.

991350833312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 333 (or 306 counting only the distinct ones).

The product of its (nonzero) digits is 524880, while the sum is 47.

The spelling of 991350833312 in words is "nine hundred ninety-one billion, three hundred fifty million, eight hundred thirty-three thousand, three hundred twelve".