991119310848 has 512 divisors, whose sum is σ = 3051938736000. Its totient is φ = 317655613440.

The previous prime is 991119310789. The next prime is 991119310849. The reversal of 991119310848 is 848013911199.

It is a tau number, because it is divible by the number of its divisors (512).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a junction number, because it is equal to n+sod(n) for n = 991119310794 and 991119310803.

It is not an unprimeable number, because it can be changed into a prime (991119310849) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3228401511 + ... + 3228401817.

Almost surely, 2^991119310848 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 991119310848, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1525969368000).

991119310848 is an abundant number, since it is smaller than the sum of its proper divisors (2060819425152).

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

991119310848 is an equidigital number, since it uses as much as digits as its factorization.

991119310848 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 476 (or 442 counting only the distinct ones).

The product of its (nonzero) digits is 559872, while the sum is 54.

The spelling of 991119310848 in words is "nine hundred ninety-one billion, one hundred nineteen million, three hundred ten thousand, eight hundred forty-eight".