9817813372520 has 16 divisors (see below), whose sum is σ = 22090080088260. Its totient is φ = 3927125348992.

The previous prime is 9817813372519. The next prime is 9817813372529. The reversal of 9817813372520 is 252733187189.

It can be written as a sum of positive squares in 2 ways, for example, as 9788375735044 + 29437637476 = 3128638^2 + 171574^2 .

It is not an unprimeable number, because it can be changed into a prime (9817813372529) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 122722667117 + ... + 122722667196.

Almost surely, 2^{9817813372520} is an apocalyptic number.

It is an amenable number.

9817813372520 is an abundant number, since it is smaller than the sum of its proper divisors (12272266715740).

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

9817813372520 is a wasteful number, since it uses less digits than its factorization.

9817813372520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 245445334324 (or 245445334320 counting only the distinct ones).

The product of its (nonzero) digits is 5080320, while the sum is 56.

The spelling of 9817813372520 in words is "nine trillion, eight hundred seventeen billion, eight hundred thirteen million, three hundred seventy-two thousand, five hundred twenty".