8378934398749 has 2 divisors, whose sum is σ = 8378934398750. Its totient is φ = 8378934398748.

The previous prime is 8378934398647. The next prime is 8378934398773. The reversal of 8378934398749 is 9478934398738.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8036697698649 + 342236700100 = 2834907^2 + 585010^2 .

It is a cyclic number.

It is not a de Polignac number, because 8378934398749 - 2²⁵ = 8378900844317 is a prime.

It is a super-2 number, since 2×8378934398749² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8378934398249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4189467199374 + 4189467199375.

It is an arithmetic number, because the mean of its divisors is an integer number (4189467199375).

Almost surely, 2^{8378934398749} is an apocalyptic number.

It is an amenable number.

8378934398749 is a deficient number, since it is larger than the sum of its proper divisors (1).

8378934398749 is an equidigital number, since it uses as much as digits as its factorization.

8378934398749 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7900913664, while the sum is 82.

The spelling of 8378934398749 in words is "eight trillion, three hundred seventy-eight billion, nine hundred thirty-four million, three hundred ninety-eight thousand, seven hundred forty-nine".