8220668297 has 4 divisors (see below), whose sum is σ = 8375775300. Its totient is φ = 8065561296.

The previous prime is 8220668279. The next prime is 8220668311. The reversal of 8220668297 is 7928660228.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5805830416 + 2414837881 = 76196^2 + 49141^2 .

It is a cyclic number.

It is not a de Polignac number, because 8220668297 - 2³² = 3925701001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8220668237) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 77553422 + ... + 77553527.

It is an arithmetic number, because the mean of its divisors is an integer number (2093943825).

Almost surely, 2^8220668297 is an apocalyptic number.

It is an amenable number.

8220668297 is a deficient number, since it is larger than the sum of its proper divisors (155107003).

8220668297 is a wasteful number, since it uses less digits than its factorization.

8220668297 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155107002.

The product of its (nonzero) digits is 1161216, while the sum is 50.

The square root of 8220668297 is about 90667.9011392676. The cubic root of 8220668297 is about 2018.2224909169. Note that the first 3 decimals are identical.

The spelling of 8220668297 in words is "eight billion, two hundred twenty million, six hundred sixty-eight thousand, two hundred ninety-seven".