9778819818 has 16 divisors (see below), whose sum is σ = 19565099136. Its totient is φ = 3258363360.

The previous prime is 9778819793. The next prime is 9778819829. The reversal of 9778819818 is 8189188779.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 293698 + ... + 325293.

It is an arithmetic number, because the mean of its divisors is an integer number (1222818696).

Almost surely, 2^9778819818 is an apocalyptic number.

9778819818 is an abundant number, since it is smaller than the sum of its proper divisors (9786279318).

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

9778819818 is a wasteful number, since it uses less digits than its factorization.

9778819818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 621629.

The product of its digits is 16257024, while the sum is 66.

The square root of 9778819818 is about 98887.9154295407. The cubic root of 9778819818 is about 2138.4321804758.

The spelling of 9778819818 in words is "nine billion, seven hundred seventy-eight million, eight hundred nineteen thousand, eight hundred eighteen".