9778998797 has 2 divisors, whose sum is σ = 9778998798. Its totient is φ = 9778998796.

The previous prime is 9778998773. The next prime is 9778998821. The reversal of 9778998797 is 7978998779.

It is a balanced prime because it is at equal distance from previous prime (9778998773) and next prime (9778998821).

It can be written as a sum of positive squares in only one way, i.e., 9265795081 + 513203716 = 96259^2 + 22654^2 .

It is a cyclic number.

It is not a de Polignac number, because 9778998797 - 2¹⁶ = 9778933261 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9778998707) by changing a digit.

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 as a sum of consecutive naturals, namely, 4889499398 + 4889499399.

It is an arithmetic number, because the mean of its divisors is an integer number (4889499399).

Almost surely, 2^9778998797 is an apocalyptic number.

It is an amenable number.

9778998797 is a deficient number, since it is larger than the sum of its proper divisors (1).

9778998797 is an equidigital number, since it uses as much as digits as its factorization.

9778998797 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1008189504, while the sum is 80.

The square root of 9778998797 is about 98888.8203843084. The cubic root of 9778998797 is about 2138.4452267713.

The spelling of 9778998797 in words is "nine billion, seven hundred seventy-eight million, nine hundred ninety-eight thousand, seven hundred ninety-seven".