9999872745780 has 192 divisors, whose sum is σ = 28596416421888. Its totient is φ = 2610047731200.

The previous prime is 9999872745773. The next prime is 9999872745829. The reversal of 9999872745780 is 875472789999.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 9999872745693 and 9999872745702.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2884299607 + ... + 2884303073.

It is an arithmetic number, because the mean of its divisors is an integer number (148939668864).

Almost surely, 2^{9999872745780} 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 9999872745780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14298208210944).

9999872745780 is an abundant number, since it is smaller than the sum of its proper divisors (18596543676108).

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

9999872745780 is a wasteful number, since it uses less digits than its factorization.

9999872745780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5446 (or 5444 counting only the distinct ones).

The product of its (nonzero) digits is 5761082880, while the sum is 84.

The spelling of 9999872745780 in words is "nine trillion, nine hundred ninety-nine billion, eight hundred seventy-two million, seven hundred forty-five thousand, seven hundred eighty".