9915280081920 has 528 divisors, whose sum is σ = 34775024880960. Its totient is φ = 2611961856000.

The previous prime is 9915280081877. The next prime is 9915280081933. The reversal of 9915280081920 is 291800825199.

9915280081920 is a `hidden beast` number, since 9 + 91 + 528 + 0 + 0 + 8 + 1 + 9 + 20 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2285151111 + ... + 2285155449.

Almost surely, 2^{9915280081920} is an apocalyptic number.

9915280081920 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 9915280081920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17387512440480).

9915280081920 is an abundant number, since it is smaller than the sum of its proper divisors (24859744799040).

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

9915280081920 is a wasteful number, since it uses less digits than its factorization.

9915280081920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4962 (or 4941 counting only the distinct ones).

The product of its (nonzero) digits is 933120, while the sum is 54.

The spelling of 9915280081920 in words is "nine trillion, nine hundred fifteen billion, two hundred eighty million, eighty-one thousand, nine hundred twenty".