78739954639 has 2 divisors, whose sum is σ = 78739954640. Its totient is φ = 78739954638.

The previous prime is 78739954627. The next prime is 78739954651. The reversal of 78739954639 is 93645993787.

It is a balanced prime because it is at equal distance from previous prime (78739954627) and next prime (78739954651).

It is a cyclic number.

It is not a de Polignac number, because 78739954639 - 2⁵ = 78739954607 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78739954619) 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, 39369977319 + 39369977320.

It is an arithmetic number, because the mean of its divisors is an integer number (39369977320).

Almost surely, 2^78739954639 is an apocalyptic number.

78739954639 is a deficient number, since it is larger than the sum of its proper divisors (1).

78739954639 is an equidigital number, since it uses as much as digits as its factorization.

78739954639 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 308629440, while the sum is 70.

The spelling of 78739954639 in words is "seventy-eight billion, seven hundred thirty-nine million, nine hundred fifty-four thousand, six hundred thirty-nine".