9975778399 has 2 divisors, whose sum is σ = 9975778400. Its totient is φ = 9975778398.

The previous prime is 9975778367. The next prime is 9975778441. The reversal of 9975778399 is 9938775799.

9975778399 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is an emirp because it is prime and its reverse (9938775799) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9975778399 - 2⁵ = 9975778367 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9915778399) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4987889199 + 4987889200.

It is an arithmetic number, because the mean of its divisors is an integer number (4987889200).

Almost surely, 2^9975778399 is an apocalyptic number.

9975778399 is a deficient number, since it is larger than the sum of its proper divisors (1).

9975778399 is an equidigital number, since it uses as much as digits as its factorization.

9975778399 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 270050760, while the sum is 73.

The square root of 9975778399 is about 99878.8185703055. The cubic root of 9975778399 is about 2152.6938218058.

The spelling of 9975778399 in words is "nine billion, nine hundred seventy-five million, seven hundred seventy-eight thousand, three hundred ninety-nine".