78739251439 has 2 divisors, whose sum is σ = 78739251440. Its totient is φ = 78739251438.

The previous prime is 78739251433. The next prime is 78739251467. The reversal of 78739251439 is 93415293787.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 78739251439 - 2⁹ = 78739250927 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78739251433) 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, 39369625719 + 39369625720.

It is an arithmetic number, because the mean of its divisors is an integer number (39369625720).

Almost surely, 2^78739251439 is an apocalyptic number.

78739251439 is a deficient number, since it is larger than the sum of its proper divisors (1).

78739251439 is an equidigital number, since it uses as much as digits as its factorization.

78739251439 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11430720, while the sum is 58.

The spelling of 78739251439 in words is "seventy-eight billion, seven hundred thirty-nine million, two hundred fifty-one thousand, four hundred thirty-nine".