857793702217 has 2 divisors, whose sum is σ = 857793702218. Its totient is φ = 857793702216.

The previous prime is 857793702209. The next prime is 857793702247. The reversal of 857793702217 is 712207397758.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 849081159936 + 8712542281 = 921456^2 + 93341^2 .

It is a cyclic number.

It is not a de Polignac number, because 857793702217 - 2³ = 857793702209 is a prime.

It is not a weakly prime, because it can be changed into another prime (857793702247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 428896851108 + 428896851109.

It is an arithmetic number, because the mean of its divisors is an integer number (428896851109).

Almost surely, 2^857793702217 is an apocalyptic number.

It is an amenable number.

857793702217 is a deficient number, since it is larger than the sum of its proper divisors (1).

857793702217 is an equidigital number, since it uses as much as digits as its factorization.

857793702217 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10372320, while the sum is 58.

The spelling of 857793702217 in words is "eight hundred fifty-seven billion, seven hundred ninety-three million, seven hundred two thousand, two hundred seventeen".