71065947439 has 2 divisors, whose sum is σ = 71065947440. Its totient is φ = 71065947438.

The previous prime is 71065947409. The next prime is 71065947457. The reversal of 71065947439 is 93474956017.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 71065947439 - 2²¹ = 71063850287 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 71065947439.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71065947409) 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, 35532973719 + 35532973720.

It is an arithmetic number, because the mean of its divisors is an integer number (35532973720).

Almost surely, 2^71065947439 is an apocalyptic number.

71065947439 is a deficient number, since it is larger than the sum of its proper divisors (1).

71065947439 is an equidigital number, since it uses as much as digits as its factorization.

71065947439 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5715360, while the sum is 55.

The spelling of 71065947439 in words is "seventy-one billion, sixty-five million, nine hundred forty-seven thousand, four hundred thirty-nine".