9865797912 has 144 divisors (see below), whose sum is σ = 28137202080. Its totient is φ = 3121977600.

The previous prime is 9865797853. The next prime is 9865797917. The reversal of 9865797912 is 2197975689.

It is a self number, because there is not a number n which added to its sum of digits gives 9865797912.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9865797917) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 3692337 + ... + 3695007.

Almost surely, 2^9865797912 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 9865797912, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14068601040).

9865797912 is an abundant number, since it is smaller than the sum of its proper divisors (18271404168).

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

9865797912 is a wasteful number, since it uses less digits than its factorization.

9865797912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2802 (or 2766 counting only the distinct ones).

The product of its digits is 17146080, while the sum is 63.

The square root of 9865797912 is about 99326.7230507480. The cubic root of 9865797912 is about 2144.7535981164.

The spelling of 9865797912 in words is "nine billion, eight hundred sixty-five million, seven hundred ninety-seven thousand, nine hundred twelve".