9778694173 has 2 divisors, whose sum is σ = 9778694174. Its totient is φ = 9778694172.

The previous prime is 9778694131. The next prime is 9778694197. The reversal of 9778694173 is 3714968779.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6319137049 + 3459557124 = 79493^2 + 58818^2 .

It is a cyclic number.

It is not a de Polignac number, because 9778694173 - 2¹³ = 9778685981 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9778694473) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4889347086 + 4889347087.

It is an arithmetic number, because the mean of its divisors is an integer number (4889347087).

Almost surely, 2^9778694173 is an apocalyptic number.

It is an amenable number.

9778694173 is a deficient number, since it is larger than the sum of its proper divisors (1).

9778694173 is an equidigital number, since it uses as much as digits as its factorization.

9778694173 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16003008, while the sum is 61.

The square root of 9778694173 is about 98887.2801375384. The cubic root of 9778694173 is about 2138.4230217543.

The spelling of 9778694173 in words is "nine billion, seven hundred seventy-eight million, six hundred ninety-four thousand, one hundred seventy-three".