9889378865 has 32 divisors (see below), whose sum is σ = 12409431936. Its totient is φ = 7559516160.

The previous prime is 9889378853. The next prime is 9889378867. The reversal of 9889378865 is 5688739889.

It is not a de Polignac number, because 9889378865 - 2¹² = 9889374769 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9889378867) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2529242 + ... + 2533148.

It is an arithmetic number, because the mean of its divisors is an integer number (387794748).

Almost surely, 2^9889378865 is an apocalyptic number.

It is an amenable number.

9889378865 is a deficient number, since it is larger than the sum of its proper divisors (2520053071).

9889378865 is a wasteful number, since it uses less digits than its factorization.

9889378865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4209.

The product of its digits is 209018880, while the sum is 71.

The square root of 9889378865 is about 99445.3561761433. The cubic root of 9889378865 is about 2146.4610150966.

The spelling of 9889378865 in words is "nine billion, eight hundred eighty-nine million, three hundred seventy-eight thousand, eight hundred sixty-five".