8455716817 has 2 divisors, whose sum is σ = 8455716818. Its totient is φ = 8455716816.

The previous prime is 8455716809. The next prime is 8455716961. The reversal of 8455716817 is 7186175548.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4685265601 + 3770451216 = 68449^2 + 61404^2 .

It is a cyclic number.

It is not a de Polignac number, because 8455716817 - 2³ = 8455716809 is a prime.

It is a super-2 number, since 2×8455716817² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (8455716517) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4227858408 + 4227858409.

It is an arithmetic number, because the mean of its divisors is an integer number (4227858409).

Almost surely, 2^8455716817 is an apocalyptic number.

It is an amenable number.

8455716817 is a deficient number, since it is larger than the sum of its proper divisors (1).

8455716817 is an equidigital number, since it uses as much as digits as its factorization.

8455716817 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1881600, while the sum is 52.

The square root of 8455716817 is about 91954.9716817965. The cubic root of 8455716817 is about 2037.2772866683.

The spelling of 8455716817 in words is "eight billion, four hundred fifty-five million, seven hundred sixteen thousand, eight hundred seventeen".