8378642369 has 2 divisors, whose sum is σ = 8378642370. Its totient is φ = 8378642368.

The previous prime is 8378642317. The next prime is 8378642381. The reversal of 8378642369 is 9632468738.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6148441744 + 2230200625 = 78412^2 + 47225^2 .

It is a cyclic number.

It is not a de Polignac number, because 8378642369 - 2²⁰ = 8377593793 is a prime.

It is a super-2 number, since 2×8378642369² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (8378642309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4189321184 + 4189321185.

It is an arithmetic number, because the mean of its divisors is an integer number (4189321185).

Almost surely, 2^8378642369 is an apocalyptic number.

It is an amenable number.

8378642369 is a deficient number, since it is larger than the sum of its proper divisors (1).

8378642369 is an equidigital number, since it uses as much as digits as its factorization.

8378642369 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10450944, while the sum is 56.

The square root of 8378642369 is about 91534.9243130730. The cubic root of 8378642369 is about 2031.0684086860.

The spelling of 8378642369 in words is "eight billion, three hundred seventy-eight million, six hundred forty-two thousand, three hundred sixty-nine".