78085261439 has 2 divisors, whose sum is σ = 78085261440. Its totient is φ = 78085261438.

The previous prime is 78085261399. The next prime is 78085261451. The reversal of 78085261439 is 93416258087.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 78085261439 - 2¹² = 78085257343 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78085261139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39042630719 + 39042630720.

It is an arithmetic number, because the mean of its divisors is an integer number (39042630720).

It is a 1-persistent number, because it is pandigital, but 2⋅78085261439 = 156170522878 is not.

Almost surely, 2^78085261439 is an apocalyptic number.

78085261439 is a deficient number, since it is larger than the sum of its proper divisors (1).

78085261439 is an equidigital number, since it uses as much as digits as its factorization.

78085261439 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2903040, while the sum is 53.

The spelling of 78085261439 in words is "seventy-eight billion, eighty-five million, two hundred sixty-one thousand, four hundred thirty-nine".