9866012832 has 144 divisors (see below), whose sum is σ = 31992203880. Its totient is φ = 2857107456.

The previous prime is 9866012813. The next prime is 9866012833. The reversal of 9866012832 is 2382106689.

9866012832 is a `hidden beast` number, since 9 + 8 + 6 + 601 + 2 + 8 + 32 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 8934786576 + 931226256 = 94524^2 + 30516^2 .

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

It is not an unprimeable number, because it can be changed into a prime (9866012833) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 13857 + ... + 141152.

Almost surely, 2^9866012832 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 9866012832, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15996101940).

9866012832 is an abundant number, since it is smaller than the sum of its proper divisors (22126191048).

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

9866012832 is a wasteful number, since it uses less digits than its factorization.

9866012832 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155055 (or 155044 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 45.

The square root of 9866012832 is about 99327.8049289322. The cubic root of 9866012832 is about 2144.7691720247.

The spelling of 9866012832 in words is "nine billion, eight hundred sixty-six million, twelve thousand, eight hundred thirty-two".