2565089613 has 10 divisors (see below), whose sum is σ = 3831800654. Its totient is φ = 1710059688.

The previous prime is 2565089609. The next prime is 2565089629. The reversal of 2565089613 is 3169805652.

2565089613 is a `hidden beast` number, since 2 + 56 + 508 + 96 + 1 + 3 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1430881929 + 1134207684 = 37827^2 + 33678^2 .

It is not a de Polignac number, because 2565089613 - 2² = 2565089609 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 (2565089603) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 15833806 + ... + 15833967.

Almost surely, 2^2565089613 is an apocalyptic number.

It is an amenable number.

2565089613 is a deficient number, since it is larger than the sum of its proper divisors (1266711041).

2565089613 is an equidigital number, since it uses as much as digits as its factorization.

2565089613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31667785 (or 31667776 counting only the distinct ones).

The product of its (nonzero) digits is 388800, while the sum is 45.

The square root of 2565089613 is about 50646.7137433417. The cubic root of 2565089613 is about 1368.8867317713.

The spelling of 2565089613 in words is "two billion, five hundred sixty-five million, eighty-nine thousand, six hundred thirteen".