9865494992 has 20 divisors (see below), whose sum is σ = 19119284100. Its totient is φ = 4931486208.

The previous prime is 9865494979. The next prime is 9865495009. The reversal of 9865494992 is 2994945689.

It can be written as a sum of positive squares in 2 ways, for example, as 7097051536 + 2768443456 = 84244^2 + 52616^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12617 + ... + 141032.

It is an arithmetic number, because the mean of its divisors is an integer number (955964205).

Almost surely, 2^9865494992 is an apocalyptic number.

It is an amenable number.

9865494992 is a deficient number, since it is larger than the sum of its proper divisors (9253789108).

9865494992 is a wasteful number, since it uses less digits than its factorization.

9865494992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 157670 (or 157664 counting only the distinct ones).

The product of its digits is 50388480, while the sum is 65.

The square root of 9865494992 is about 99325.1981724678. The cubic root of 9865494992 is about 2144.7316470144.

The spelling of 9865494992 in words is "nine billion, eight hundred sixty-five million, four hundred ninety-four thousand, nine hundred ninety-two".