2565266613 has 64 divisors (see below), whose sum is σ = 4416921600. Its totient is φ = 1287145728.

The previous prime is 2565266597. The next prime is 2565266623. The reversal of 2565266613 is 3166625652.

It is not a de Polignac number, because 2565266613 - 2⁴ = 2565266597 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2565266623) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1248495 + ... + 1250547.

It is an arithmetic number, because the mean of its divisors is an integer number (69014400).

Almost surely, 2^2565266613 is an apocalyptic number.

2565266613 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

2565266613 is a deficient number, since it is larger than the sum of its proper divisors (1851654987).

2565266613 is a wasteful number, since it uses less digits than its factorization.

2565266613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2298.

The product of its digits is 388800, while the sum is 42.

The square root of 2565266613 is about 50648.4611118640. The cubic root of 2565266613 is about 1368.9182170104.

The spelling of 2565266613 in words is "two billion, five hundred sixty-five million, two hundred sixty-six thousand, six hundred thirteen".