8220609697 has 2 divisors, whose sum is σ = 8220609698. Its totient is φ = 8220609696.

The previous prime is 8220609623. The next prime is 8220609701. The reversal of 8220609697 is 7969060228.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7736785681 + 483824016 = 87959^2 + 21996^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8220609697 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 8220609697.

It is not a weakly prime, because it can be changed into another prime (8220606697) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4110304848 + 4110304849.

It is an arithmetic number, because the mean of its divisors is an integer number (4110304849).

Almost surely, 2^8220609697 is an apocalyptic number.

It is an amenable number.

8220609697 is a deficient number, since it is larger than the sum of its proper divisors (1).

8220609697 is an equidigital number, since it uses as much as digits as its factorization.

8220609697 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 653184, while the sum is 49.

The square root of 8220609697 is about 90667.5779813269. The cubic root of 8220609697 is about 2018.2176953572.

The spelling of 8220609697 in words is "eight billion, two hundred twenty million, six hundred nine thousand, six hundred ninety-seven".