9644753557872 has 480 divisors, whose sum is σ = 29289142874880. Its totient is φ = 3037487731200.

The previous prime is 9644753557847. The next prime is 9644753557913. The reversal of 9644753557872 is 2787553574469.

9644753557872 is a `hidden beast` number, since 9 + 6 + 4 + 4 + 7 + 535 + 5 + 7 + 87 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a self number, because there is not a number n which added to its sum of digits gives 9644753557872.

It is a congruent number.

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, 4994692747 + ... + 4994694677.

It is an arithmetic number, because the mean of its divisors is an integer number (61019047656).

Almost surely, 2^{9644753557872} 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 9644753557872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14644571437440).

9644753557872 is an abundant number, since it is smaller than the sum of its proper divisors (19644389317008).

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

9644753557872 is a wasteful number, since it uses less digits than its factorization.

9644753557872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2290 (or 2247 counting only the distinct ones).

The product of its digits is 1778112000, while the sum is 72.

The spelling of 9644753557872 in words is "nine trillion, six hundred forty-four billion, seven hundred fifty-three million, five hundred fifty-seven thousand, eight hundred seventy-two".