991796543136 has 144 divisors (see below), whose sum is σ = 3363484086144. Its totient is φ = 271049974272.

The previous prime is 991796543099. The next prime is 991796543189. The reversal of 991796543136 is 631345697199.

991796543136 is a `hidden beast` number, since 9 + 9 + 1 + 79 + 6 + 543 + 13 + 6 = 666.

It is a tau number, because it is divible by the number of its divisors (144).

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10648471 + ... + 10741206.

It is an arithmetic number, because the mean of its divisors is an integer number (23357528376).

Almost surely, 2^991796543136 is an apocalyptic number.

991796543136 is a gapful number since it is divisible by the number (96) formed by its first and last digit.

It is an amenable number.

991796543136 is an abundant number, since it is smaller than the sum of its proper divisors (2371687543008).

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

991796543136 is a wasteful number, since it uses less digits than its factorization.

991796543136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21389723 (or 21389712 counting only the distinct ones).

The product of its digits is 33067440, while the sum is 63.

The spelling of 991796543136 in words is "nine hundred ninety-one billion, seven hundred ninety-six million, five hundred forty-three thousand, one hundred thirty-six".