9999778493 has 2 divisors, whose sum is σ = 9999778494. Its totient is φ = 9999778492.

The previous prime is 9999778487. The next prime is 9999778499. The reversal of 9999778493 is 3948779999.

9999778493 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a balanced prime because it is at equal distance from previous prime (9999778487) and next prime (9999778499).

It can be written as a sum of positive squares in only one way, i.e., 8948592409 + 1051186084 = 94597^2 + 32422^2 .

It is a cyclic number.

It is not a de Polignac number, because 9999778493 - 2¹⁴ = 9999762109 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 9999778493.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9999778499) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4999889246 + 4999889247.

It is an arithmetic number, because the mean of its divisors is an integer number (4999889247).

Almost surely, 2^9999778493 is an apocalyptic number.

It is an amenable number.

9999778493 is a deficient number, since it is larger than the sum of its proper divisors (1).

9999778493 is an equidigital number, since it uses as much as digits as its factorization.

9999778493 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 277766496, while the sum is 74.

The square root of 9999778493 is about 99998.8924588668. The cubic root of 9999778493 is about 2154.4187825023.

The spelling of 9999778493 in words is "nine billion, nine hundred ninety-nine million, seven hundred seventy-eight thousand, four hundred ninety-three".