78842057839 has 2 divisors, whose sum is σ = 78842057840. Its totient is φ = 78842057838.

The previous prime is 78842057803. The next prime is 78842057851. The reversal of 78842057839 is 93875024887.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 78842057839 - 2⁷ = 78842057711 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78842057339) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39421028919 + 39421028920.

It is an arithmetic number, because the mean of its divisors is an integer number (39421028920).

Almost surely, 2^78842057839 is an apocalyptic number.

78842057839 is a deficient number, since it is larger than the sum of its proper divisors (1).

78842057839 is an equidigital number, since it uses as much as digits as its factorization.

78842057839 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27095040, while the sum is 61.

The spelling of 78842057839 in words is "seventy-eight billion, eight hundred forty-two million, fifty-seven thousand, eight hundred thirty-nine".