2566567397 has 2 divisors, whose sum is σ = 2566567398. Its totient is φ = 2566567396.

The previous prime is 2566567379. The next prime is 2566567429. The reversal of 2566567397 is 7937656652.

Together with previous prime (2566567379) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1988357281 + 578210116 = 44591^2 + 24046^2 .

It is a cyclic number.

It is not a de Polignac number, because 2566567397 - 2²⁰ = 2565518821 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2566567697) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1283283698 + 1283283699.

It is an arithmetic number, because the mean of its divisors is an integer number (1283283699).

Almost surely, 2^2566567397 is an apocalyptic number.

It is an amenable number.

2566567397 is a deficient number, since it is larger than the sum of its proper divisors (1).

2566567397 is an equidigital number, since it uses as much as digits as its factorization.

2566567397 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 14288400, while the sum is 56.

The square root of 2566567397 is about 50661.3007827474. The cubic root of 2566567397 is about 1369.1495595684.

The spelling of 2566567397 in words is "two billion, five hundred sixty-six million, five hundred sixty-seven thousand, three hundred ninety-seven".