991496045826 has 192 divisors, whose sum is σ = 2591374705920. Its totient is φ = 269948160000.

The previous prime is 991496045819. The next prime is 991496045851. The reversal of 991496045826 is 628540694199.

991496045826 is a `hidden beast` number, since 9 + 9 + 1 + 49 + 6 + 0 + 4 + 582 + 6 = 666.

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 95 ways as a sum of consecutive naturals, for example, 46318726 + ... + 46340126.

It is an arithmetic number, because the mean of its divisors is an integer number (13496743260).

Almost surely, 2^991496045826 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 991496045826, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1295687352960).

991496045826 is an abundant number, since it is smaller than the sum of its proper divisors (1599878660094).

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

991496045826 is a wasteful number, since it uses less digits than its factorization.

991496045826 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21913 (or 21910 counting only the distinct ones).

The product of its (nonzero) digits is 33592320, while the sum is 63.

The spelling of 991496045826 in words is "nine hundred ninety-one billion, four hundred ninety-six million, forty-five thousand, eight hundred twenty-six".