2565735665 has 8 divisors (see below), whose sum is σ = 3108775488. Its totient is φ = 2032660080.

The previous prime is 2565735619. The next prime is 2565735703. The reversal of 2565735665 is 5665375652.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2565735665 - 2¹² = 2565731569 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2490491 + ... + 2491520.

It is an arithmetic number, because the mean of its divisors is an integer number (388596936).

Almost surely, 2^2565735665 is an apocalyptic number.

It is an amenable number.

2565735665 is a deficient number, since it is larger than the sum of its proper divisors (543039823).

2565735665 is a wasteful number, since it uses less digits than its factorization.

2565735665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4982119.

The product of its digits is 5670000, while the sum is 50.

The square root of 2565735665 is about 50653.0913666678. The cubic root of 2565735665 is about 1369.0016462458.

The spelling of 2565735665 in words is "two billion, five hundred sixty-five million, seven hundred thirty-five thousand, six hundred sixty-five".