817135682873 has 2 divisors, whose sum is σ = 817135682874. Its totient is φ = 817135682872.

The previous prime is 817135682833. The next prime is 817135682897. The reversal of 817135682873 is 378286531718.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 769878140329 + 47257542544 = 877427^2 + 217388^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-817135682873 is a prime.

It is not a weakly prime, because it can be changed into another prime (817135682833) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 408567841436 + 408567841437.

It is an arithmetic number, because the mean of its divisors is an integer number (408567841437).

Almost surely, 2^817135682873 is an apocalyptic number.

It is an amenable number.

817135682873 is a deficient number, since it is larger than the sum of its proper divisors (1).

817135682873 is an equidigital number, since it uses as much as digits as its factorization.

817135682873 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13547520, while the sum is 59.

The spelling of 817135682873 in words is "eight hundred seventeen billion, one hundred thirty-five million, six hundred eighty-two thousand, eight hundred seventy-three".