819856804339 has 2 divisors, whose sum is σ = 819856804340. Its totient is φ = 819856804338.

The previous prime is 819856804303. The next prime is 819856804363. The reversal of 819856804339 is 933408658918.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 819856804339 - 2⁹ = 819856803827 is a prime.

It is not a weakly prime, because it can be changed into another prime (819856804379) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 409928402169 + 409928402170.

It is an arithmetic number, because the mean of its divisors is an integer number (409928402170).

Almost surely, 2^819856804339 is an apocalyptic number.

819856804339 is a deficient number, since it is larger than the sum of its proper divisors (1).

819856804339 is an equidigital number, since it uses as much as digits as its factorization.

819856804339 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 44789760, while the sum is 64.

The spelling of 819856804339 in words is "eight hundred nineteen billion, eight hundred fifty-six million, eight hundred four thousand, three hundred thirty-nine".