8340778639 has 2 divisors, whose sum is σ = 8340778640. Its totient is φ = 8340778638.

The previous prime is 8340778619. The next prime is 8340778759. The reversal of 8340778639 is 9368770438.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 8340778639 - 2¹⁵ = 8340745871 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 8340778639.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8340778609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4170389319 + 4170389320.

It is an arithmetic number, because the mean of its divisors is an integer number (4170389320).

Almost surely, 2^8340778639 is an apocalyptic number.

8340778639 is a deficient number, since it is larger than the sum of its proper divisors (1).

8340778639 is an equidigital number, since it uses as much as digits as its factorization.

8340778639 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6096384, while the sum is 55.

The square root of 8340778639 is about 91327.8634317041. The cubic root of 8340778639 is about 2028.0042701723.

The spelling of 8340778639 in words is "eight billion, three hundred forty million, seven hundred seventy-eight thousand, six hundred thirty-nine".