7845668399 has 2 divisors, whose sum is σ = 7845668400. Its totient is φ = 7845668398.

The previous prime is 7845668377. The next prime is 7845668513. The reversal of 7845668399 is 9938665487.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 7845668399 - 2⁸ = 7845668143 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7845668339) 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, 3922834199 + 3922834200.

It is an arithmetic number, because the mean of its divisors is an integer number (3922834200).

Almost surely, 2^7845668399 is an apocalyptic number.

7845668399 is a deficient number, since it is larger than the sum of its proper divisors (1).

7845668399 is an equidigital number, since it uses as much as digits as its factorization.

7845668399 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 78382080, while the sum is 65.

The square root of 7845668399 is about 88575.7777216774. Note that the first 4 decimals coincide. The cubic root of 7845668399 is about 1987.0554330951.

The spelling of 7845668399 in words is "seven billion, eight hundred forty-five million, six hundred sixty-eight thousand, three hundred ninety-nine".