8447394956309 has 2 divisors, whose sum is σ = 8447394956310. Its totient is φ = 8447394956308.

The previous prime is 8447394956261. The next prime is 8447394956347. The reversal of 8447394956309 is 9036594937448.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4505494438225 + 3941900518084 = 2122615^2 + 1985422^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8447394956309 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8447394956389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4223697478154 + 4223697478155.

It is an arithmetic number, because the mean of its divisors is an integer number (4223697478155).

Almost surely, 2^{8447394956309} is an apocalyptic number.

It is an amenable number.

8447394956309 is a deficient number, since it is larger than the sum of its proper divisors (1).

8447394956309 is an equidigital number, since it uses as much as digits as its factorization.

8447394956309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 705438720, while the sum is 71.

The spelling of 8447394956309 in words is "eight trillion, four hundred forty-seven billion, three hundred ninety-four million, nine hundred fifty-six thousand, three hundred nine".