991733363712 has 1056 divisors, whose sum is σ = 3631167601152. Its totient is φ = 253784752128.

The previous prime is 991733363711. The next prime is 991733363741. The reversal of 991733363712 is 217363337199.

It is a happy number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (991733363711) by changing a digit.

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 95 ways as a sum of consecutive naturals, for example, 5938523053 + ... + 5938523219.

Almost surely, 2^991733363712 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 991733363712, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1815583800576).

991733363712 is an abundant number, since it is smaller than the sum of its proper divisors (2639434237440).

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

991733363712 is a wasteful number, since it uses less digits than its factorization.

991733363712 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 383 (or 362 counting only the distinct ones).

The product of its digits is 3857868, while the sum is 54.

The spelling of 991733363712 in words is "nine hundred ninety-one billion, seven hundred thirty-three million, three hundred sixty-three thousand, seven hundred twelve".