9991715976 has 48 divisors (see below), whose sum is σ = 29520981360. Its totient is φ = 3027792480.

The previous prime is 9991715891. The next prime is 9991716013. The reversal of 9991715976 is 6795171999.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6307110 + ... + 6308693.

It is an arithmetic number, because the mean of its divisors is an integer number (615020445).

Almost surely, 2^9991715976 is an apocalyptic number.

It is an amenable number.

9991715976 is an abundant number, since it is smaller than the sum of its proper divisors (19529265384).

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

9991715976 is a wasteful number, since it uses less digits than its factorization.

9991715976 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12615826 (or 12615819 counting only the distinct ones).

The product of its digits is 9644670, while the sum is 63.

The square root of 9991715976 is about 99958.5712983134. The cubic root of 9991715976 is about 2153.8396127245.

The spelling of 9991715976 in words is "nine billion, nine hundred ninety-one million, seven hundred fifteen thousand, nine hundred seventy-six".