2566565473 has 2 divisors, whose sum is σ = 2566565474. Its totient is φ = 2566565472.

The previous prime is 2566565471. The next prime is 2566565489. The reversal of 2566565473 is 3745656652.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2410515409 + 156050064 = 49097^2 + 12492^2 .

It is a cyclic number.

It is not a de Polignac number, because 2566565473 - 2¹ = 2566565471 is a prime.

Together with 2566565471, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (2566565471) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1283282736 + 1283282737.

It is an arithmetic number, because the mean of its divisors is an integer number (1283282737).

Almost surely, 2^2566565473 is an apocalyptic number.

It is an amenable number.

2566565473 is a deficient number, since it is larger than the sum of its proper divisors (1).

2566565473 is an equidigital number, since it uses as much as digits as its factorization.

2566565473 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4536000, while the sum is 49.

The square root of 2566565473 is about 50661.2817938907. The cubic root of 2566565473 is about 1369.1492174455.

The spelling of 2566565473 in words is "two billion, five hundred sixty-six million, five hundred sixty-five thousand, four hundred seventy-three".