991543246848 has 1080 divisors, whose sum is σ = 3818036005056. Its totient is φ = 241875025920.

The previous prime is 991543246829. The next prime is 991543246861. The reversal of 991543246848 is 848642345199.

991543246848 is a `hidden beast` number, since 9 + 9 + 1 + 543 + 2 + 4 + 6 + 84 + 8 = 666.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 2123218711 + ... + 2123219177.

Almost surely, 2^991543246848 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 991543246848, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1909018002528).

991543246848 is an abundant number, since it is smaller than the sum of its proper divisors (2826492758208).

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

991543246848 is a wasteful number, since it uses less digits than its factorization.

991543246848 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 547 (or 507 counting only the distinct ones).

The product of its digits is 59719680, while the sum is 63.

The spelling of 991543246848 in words is "nine hundred ninety-one billion, five hundred forty-three million, two hundred forty-six thousand, eight hundred forty-eight".