9778998773 has 2 divisors, whose sum is σ = 9778998774. Its totient is φ = 9778998772.

The previous prime is 9778998707. The next prime is 9778998797. The reversal of 9778998773 is 3778998779.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8672638129 + 1106360644 = 93127^2 + 33262^2 .

It is a cyclic number.

It is not a de Polignac number, because 9778998773 - 2¹⁰ = 9778997749 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 9778998773.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9778998673) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4889499386 + 4889499387.

It is an arithmetic number, because the mean of its divisors is an integer number (4889499387).

Almost surely, 2^9778998773 is an apocalyptic number.

It is an amenable number.

9778998773 is a deficient number, since it is larger than the sum of its proper divisors (1).

9778998773 is an equidigital number, since it uses as much as digits as its factorization.

9778998773 is an evil number, because the sum of its binary digits is even.

The product of its digits is 336063168, while the sum is 74.

The square root of 9778998773 is about 98888.8202629600. The cubic root of 9778998773 is about 2138.4452250219.

The spelling of 9778998773 in words is "nine billion, seven hundred seventy-eight million, nine hundred ninety-eight thousand, seven hundred seventy-three".