8217671978839 has 2 divisors, whose sum is σ = 8217671978840. Its totient is φ = 8217671978838.

The previous prime is 8217671978741. The next prime is 8217671978881. The reversal of 8217671978839 is 9388791767128.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 8217671978839 - 2¹³ = 8217671970647 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8217671978039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4108835989419 + 4108835989420.

It is an arithmetic number, because the mean of its divisors is an integer number (4108835989420).

Almost surely, 2^{8217671978839} is an apocalyptic number.

8217671978839 is a deficient number, since it is larger than the sum of its proper divisors (1).

8217671978839 is an equidigital number, since it uses as much as digits as its factorization.

8217671978839 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 512096256, while the sum is 76.

The spelling of 8217671978839 in words is "eight trillion, two hundred seventeen billion, six hundred seventy-one million, nine hundred seventy-eight thousand, eight hundred thirty-nine".