2545566769 has 2 divisors, whose sum is σ = 2545566770. Its totient is φ = 2545566768.

The previous prime is 2545566739. The next prime is 2545566797. The reversal of 2545566769 is 9676655452.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1676083600 + 869483169 = 40940^2 + 29487^2 .

It is a cyclic number.

It is not a de Polignac number, because 2545566769 - 2¹³ = 2545558577 is a prime.

It is a super-2 number, since 2×2545566769² = 12959820350874198722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2545566719) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1272783384 + 1272783385.

It is an arithmetic number, because the mean of its divisors is an integer number (1272783385).

Almost surely, 2^2545566769 is an apocalyptic number.

It is an amenable number.

2545566769 is a deficient number, since it is larger than the sum of its proper divisors (1).

2545566769 is an equidigital number, since it uses as much as digits as its factorization.

2545566769 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13608000, while the sum is 55.

The square root of 2545566769 is about 50453.6100690525. The cubic root of 2545566769 is about 1365.4050275123.

Adding to 2545566769 its reverse (9676655452), we get a palindrome (12222222221).

The spelling of 2545566769 in words is "two billion, five hundred forty-five million, five hundred sixty-six thousand, seven hundred sixty-nine".