9978722329 has 2 divisors, whose sum is σ = 9978722330. Its totient is φ = 9978722328.

The previous prime is 9978722279. The next prime is 9978722387. The reversal of 9978722329 is 9232278799.

It is an a-pointer prime, because the next prime (9978722387) can be obtained adding 9978722329 to its sum of digits (58).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6344441104 + 3634281225 = 79652^2 + 60285^2 .

It is an emirp because it is prime and its reverse (9232278799) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9978722329 - 2¹¹ = 9978720281 is a prime.

It is not a weakly prime, because it can be changed into another prime (9978722399) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4989361164 + 4989361165.

It is an arithmetic number, because the mean of its divisors is an integer number (4989361165).

Almost surely, 2^9978722329 is an apocalyptic number.

It is an amenable number.

9978722329 is a deficient number, since it is larger than the sum of its proper divisors (1).

9978722329 is an equidigital number, since it uses as much as digits as its factorization.

9978722329 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6858432, while the sum is 58.

The square root of 9978722329 is about 99893.5549923017. The cubic root of 9978722329 is about 2152.9055598901.

The spelling of 9978722329 in words is "nine billion, nine hundred seventy-eight million, seven hundred twenty-two thousand, three hundred twenty-nine".