9966840084 has 18 divisors (see below), whose sum is σ = 25193956970. Its totient is φ = 3322280016.

The previous prime is 9966840073. The next prime is 9966840137. The reversal of 9966840084 is 4800486699.

It can be written as a sum of positive squares in only one way, i.e., 9935703684 + 31136400 = 99678^2 + 5580^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a self number, because there is not a number n which added to its sum of digits gives 9966840084.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 138428299 + ... + 138428370.

Almost surely, 2^9966840084 is an apocalyptic number.

It is an amenable number.

9966840084 is an abundant number, since it is smaller than the sum of its proper divisors (15227116886).

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

9966840084 is a wasteful number, since it uses less digits than its factorization.

9966840084 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 276856679 (or 276856674 counting only the distinct ones).

The product of its (nonzero) digits is 2985984, while the sum is 54.

The square root of 9966840084 is about 99834.0627441356. The cubic root of 9966840084 is about 2152.0506905345.

The spelling of 9966840084 in words is "nine billion, nine hundred sixty-six million, eight hundred forty thousand, eighty-four".