9978350565 has 32 divisors (see below), whose sum is σ = 16291123200. Its totient is φ = 5214231360.

The previous prime is 9978350563. The next prime is 9978350581. The reversal of 9978350565 is 5650538799.

It is not a de Polignac number, because 9978350565 - 2¹ = 9978350563 is a prime.

It is a Smith number, since the sum of its digits (57) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9978350563) 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, 123096 + ... + 187374.

It is an arithmetic number, because the mean of its divisors is an integer number (509097600).

Almost surely, 2^9978350565 is an apocalyptic number.

It is an amenable number.

9978350565 is a deficient number, since it is larger than the sum of its proper divisors (6312772635).

9978350565 is a wasteful number, since it uses less digits than its factorization.

9978350565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64497.

The product of its (nonzero) digits is 10206000, while the sum is 57.

The square root of 9978350565 is about 99891.6941742405. The cubic root of 9978350565 is about 2152.8788235774.

The spelling of 9978350565 in words is "nine billion, nine hundred seventy-eight million, three hundred fifty thousand, five hundred sixty-five".