2565822613 has 16 divisors (see below), whose sum is σ = 2617162240. Its totient is φ = 2515178304.

The previous prime is 2565822607. The next prime is 2565822691. The reversal of 2565822613 is 3162285652.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 2565822613 - 2⁹ = 2565822101 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2565822013) 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 15 ways as a sum of consecutive naturals, for example, 6878695 + ... + 6879067.

It is an arithmetic number, because the mean of its divisors is an integer number (163572640).

Almost surely, 2^2565822613 is an apocalyptic number.

It is an amenable number.

2565822613 is a deficient number, since it is larger than the sum of its proper divisors (51339627).

2565822613 is a wasteful number, since it uses less digits than its factorization.

2565822613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 988.

The product of its digits is 172800, while the sum is 40.

The square root of 2565822613 is about 50653.9496288295. The cubic root of 2565822613 is about 1369.0171103759.

The spelling of 2565822613 in words is "two billion, five hundred sixty-five million, eight hundred twenty-two thousand, six hundred thirteen".