9919781168 has 20 divisors (see below), whose sum is σ = 20966810568. Its totient is φ = 4508991360.

The previous prime is 9919781167. The next prime is 9919781213. The reversal of 9919781168 is 8611879199.

It is not an unprimeable number, because it can be changed into a prime (9919781161) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28181021 + ... + 28181372.

Almost surely, 2^9919781168 is an apocalyptic number.

It is an amenable number.

9919781168 is an abundant number, since it is smaller than the sum of its proper divisors (11047029400).

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

9919781168 is a wasteful number, since it uses less digits than its factorization.

9919781168 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56362412 (or 56362406 counting only the distinct ones).

The product of its digits is 1959552, while the sum is 59.

The square root of 9919781168 is about 99598.0982147752. The cubic root of 9919781168 is about 2148.6583421756.

The spelling of 9919781168 in words is "nine billion, nine hundred nineteen million, seven hundred eighty-one thousand, one hundred sixty-eight".