9916812520 has 64 divisors (see below), whose sum is σ = 22956066000. Its totient is φ = 3852748800.

The previous prime is 9916812511. The next prime is 9916812553. The reversal of 9916812520 is 252186199.

It can be written as a sum of positive squares in 8 ways, for example, as 7277113636 + 2639698884 = 85306^2 + 51378^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 883906 + ... + 895054.

Almost surely, 2^9916812520 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 9916812520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11478033000).

9916812520 is an abundant number, since it is smaller than the sum of its proper divisors (13039253480).

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

9916812520 is a wasteful number, since it uses less digits than its factorization.

9916812520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11798 (or 11794 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 43.

The square root of 9916812520 is about 99583.1939636403. The cubic root of 9916812520 is about 2148.4439810391.

The spelling of 9916812520 in words is "nine billion, nine hundred sixteen million, eight hundred twelve thousand, five hundred twenty".