9798015785520 has 40 divisors (see below), whose sum is σ = 30373848935856. Its totient is φ = 2612804209408.

The previous prime is 9798015785491. The next prime is 9798015785581. The reversal of 9798015785520 is 255875108979.

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×9798015785520² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20412532647 + ... + 20412533126.

Almost surely, 2^{9798015785520} is an apocalyptic number.

It is an amenable number.

9798015785520 is an abundant number, since it is smaller than the sum of its proper divisors (20575833150336).

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

9798015785520 is a wasteful number, since it uses less digits than its factorization.

9798015785520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40825065789 (or 40825065783 counting only the distinct ones).

The product of its (nonzero) digits is 63504000, while the sum is 66.

The spelling of 9798015785520 in words is "nine trillion, seven hundred ninety-eight billion, fifteen million, seven hundred eighty-five thousand, five hundred twenty".