6378778739 has 2 divisors, whose sum is σ = 6378778740. Its totient is φ = 6378778738.

The previous prime is 6378778733. The next prime is 6378778817. The reversal of 6378778739 is 9378778736.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6378778739 - 2²⁴ = 6362001523 is a prime.

It is a super-2 number, since 2×6378778739² = 81377636402236860242, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (6378778733) 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, 3189389369 + 3189389370.

It is an arithmetic number, because the mean of its divisors is an integer number (3189389370).

Almost surely, 2^6378778739 is an apocalyptic number.

6378778739 is a deficient number, since it is larger than the sum of its proper divisors (1).

6378778739 is an equidigital number, since it uses as much as digits as its factorization.

6378778739 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 74680704, while the sum is 65.

The square root of 6378778739 is about 79867.2569893320. The cubic root of 6378778739 is about 1854.5811701329.

The spelling of 6378778739 in words is "six billion, three hundred seventy-eight million, seven hundred seventy-eight thousand, seven hundred thirty-nine".