8220698217 has 6 divisors (see below), whose sum is σ = 11874341882. Its totient is φ = 5480465472.

The previous prime is 8220698201. The next prime is 8220698257. The reversal of 8220698217 is 7128960228.

It can be written as a sum of positive squares in only one way, i.e., 6780040281 + 1440657936 = 82341^2 + 37956^2 .

It is not a de Polignac number, because 8220698217 - 2⁴ = 8220698201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8220698257) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 456705448 + ... + 456705465.

Almost surely, 2^8220698217 is an apocalyptic number.

It is an amenable number.

8220698217 is a deficient number, since it is larger than the sum of its proper divisors (3653643665).

8220698217 is a wasteful number, since it uses less digits than its factorization.

8220698217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 913410919 (or 913410916 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 45.

The square root of 8220698217 is about 90668.0661368709. The cubic root of 8220698217 is about 2018.2249394261.

The spelling of 8220698217 in words is "eight billion, two hundred twenty million, six hundred ninety-eight thousand, two hundred seventeen".