9978822865 has 16 divisors (see below), whose sum is σ = 13065212160. Its totient is φ = 7256200320.

The previous prime is 9978822839. The next prime is 9978822901. The reversal of 9978822865 is 5682288799.

It is not a de Polignac number, because 9978822865 - 2³³ = 1388888273 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 9978822797 and 9978822806.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 541432 + ... + 559558.

It is an arithmetic number, because the mean of its divisors is an integer number (816575760).

Almost surely, 2^9978822865 is an apocalyptic number.

It is an amenable number.

9978822865 is a deficient number, since it is larger than the sum of its proper divisors (3086389295).

9978822865 is a wasteful number, since it uses less digits than its factorization.

9978822865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28152.

The product of its digits is 34836480, while the sum is 64.

The square root of 9978822865 is about 99894.0582066821. The cubic root of 9978822865 is about 2152.9127900671.

The spelling of 9978822865 in words is "nine billion, nine hundred seventy-eight million, eight hundred twenty-two thousand, eight hundred sixty-five".