817213685417 has 2 divisors, whose sum is σ = 817213685418. Its totient is φ = 817213685416.

The previous prime is 817213685413. The next prime is 817213685441. The reversal of 817213685417 is 714586312718.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 752502465961 + 64711219456 = 867469^2 + 254384^2 .

It is a cyclic number.

It is not a de Polignac number, because 817213685417 - 2² = 817213685413 is a prime.

It is not a weakly prime, because it can be changed into another prime (817213685413) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 408606842708 + 408606842709.

It is an arithmetic number, because the mean of its divisors is an integer number (408606842709).

Almost surely, 2^817213685417 is an apocalyptic number.

It is an amenable number.

817213685417 is a deficient number, since it is larger than the sum of its proper divisors (1).

817213685417 is an equidigital number, since it uses as much as digits as its factorization.

817213685417 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2257920, while the sum is 53.

The spelling of 817213685417 in words is "eight hundred seventeen billion, two hundred thirteen million, six hundred eighty-five thousand, four hundred seventeen".