8331566849 has 2 divisors, whose sum is σ = 8331566850. Its totient is φ = 8331566848.

The previous prime is 8331566821. The next prime is 8331566933. The reversal of 8331566849 is 9486651338.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7953964225 + 377602624 = 89185^2 + 19432^2 .

It is a cyclic number.

It is not a de Polignac number, because 8331566849 - 2¹⁶ = 8331501313 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 8331566849.

It is not a weakly prime, because it can be changed into another prime (8331566149) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4165783424 + 4165783425.

It is an arithmetic number, because the mean of its divisors is an integer number (4165783425).

Almost surely, 2^8331566849 is an apocalyptic number.

It is an amenable number.

8331566849 is a deficient number, since it is larger than the sum of its proper divisors (1).

8331566849 is an equidigital number, since it uses as much as digits as its factorization.

8331566849 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3732480, while the sum is 53.

The square root of 8331566849 is about 91277.4169715598. The cubic root of 8331566849 is about 2027.2574002071.

The spelling of 8331566849 in words is "eight billion, three hundred thirty-one million, five hundred sixty-six thousand, eight hundred forty-nine".