978823286689 has 2 divisors, whose sum is σ = 978823286690. Its totient is φ = 978823286688.

The previous prime is 978823286687. The next prime is 978823286789. The reversal of 978823286689 is 986682328879.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 557959699089 + 420863587600 = 746967^2 + 648740^2 .

It is a cyclic number.

It is not a de Polignac number, because 978823286689 - 2¹ = 978823286687 is a prime.

Together with 978823286687, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (978823286687) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 489411643344 + 489411643345.

It is an arithmetic number, because the mean of its divisors is an integer number (489411643345).

Almost surely, 2^978823286689 is an apocalyptic number.

It is an amenable number.

978823286689 is a deficient number, since it is larger than the sum of its proper divisors (1).

978823286689 is an equidigital number, since it uses as much as digits as its factorization.

978823286689 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1003290624, while the sum is 76.

The spelling of 978823286689 in words is "nine hundred seventy-eight billion, eight hundred twenty-three million, two hundred eighty-six thousand, six hundred eighty-nine".