2566553449 has 2 divisors, whose sum is σ = 2566553450. Its totient is φ = 2566553448.

The previous prime is 2566553443. The next prime is 2566553477. The reversal of 2566553449 is 9443556652.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1341903424 + 1224650025 = 36632^2 + 34995^2 .

It is a cyclic number.

It is not a de Polignac number, because 2566553449 - 2¹⁹ = 2566029161 is a prime.

It is not a weakly prime, because it can be changed into another prime (2566553443) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1283276724 + 1283276725.

It is an arithmetic number, because the mean of its divisors is an integer number (1283276725).

Almost surely, 2^2566553449 is an apocalyptic number.

It is an amenable number.

2566553449 is a deficient number, since it is larger than the sum of its proper divisors (1).

2566553449 is an equidigital number, since it uses as much as digits as its factorization.

2566553449 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3888000, while the sum is 49.

The square root of 2566553449 is about 50661.1631232446. The cubic root of 2566553449 is about 1369.1470793514.

The spelling of 2566553449 in words is "two billion, five hundred sixty-six million, five hundred fifty-three thousand, four hundred forty-nine".