2565259673 has 4 divisors (see below), whose sum is σ = 2700273360. Its totient is φ = 2430245988.

The previous prime is 2565259661. The next prime is 2565259681. The reversal of 2565259673 is 3769525652.

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 a de Polignac number, because none of the positive numbers 2^k-2565259673 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2565259573) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 67506815 + ... + 67506852.

It is an arithmetic number, because the mean of its divisors is an integer number (675068340).

Almost surely, 2^2565259673 is an apocalyptic number.

It is an amenable number.

2565259673 is a deficient number, since it is larger than the sum of its proper divisors (135013687).

2565259673 is a wasteful number, since it uses less digits than its factorization.

2565259673 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135013686.

The product of its digits is 3402000, while the sum is 50.

The square root of 2565259673 is about 50648.3926003580. The cubic root of 2565259673 is about 1368.9169825317.

The spelling of 2565259673 in words is "two billion, five hundred sixty-five million, two hundred fifty-nine thousand, six hundred seventy-three".