2565434549 has 4 divisors (see below), whose sum is σ = 2700457440. Its totient is φ = 2430411660.

The previous prime is 2565434539. The next prime is 2565434609. The reversal of 2565434549 is 9454345652.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2565434549 - 2⁸ = 2565434293 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2565434539) 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 in 3 ways as a sum of consecutive naturals, for example, 67511417 + ... + 67511454.

It is an arithmetic number, because the mean of its divisors is an integer number (675114360).

Almost surely, 2^2565434549 is an apocalyptic number.

It is an amenable number.

2565434549 is a deficient number, since it is larger than the sum of its proper divisors (135022891).

2565434549 is a wasteful number, since it uses less digits than its factorization.

2565434549 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135022890.

The product of its digits is 2592000, while the sum is 47.

The square root of 2565434549 is about 50650.1189435918. The cubic root of 2565434549 is about 1368.9480885816.

The spelling of 2565434549 in words is "two billion, five hundred sixty-five million, four hundred thirty-four thousand, five hundred forty-nine".