2565413665 has 8 divisors (see below), whose sum is σ = 3153581928. Its totient is φ = 2002273920.

The previous prime is 2565413663. The next prime is 2565413699. The reversal of 2565413665 is 5663145652.

It can be written as a sum of positive squares in 4 ways, for example, as 416813056 + 2148600609 = 20416^2 + 46353^2 .

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

It is not a de Polignac number, because 2565413665 - 2¹ = 2565413663 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2565413663) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6256902 + ... + 6257311.

It is an arithmetic number, because the mean of its divisors is an integer number (394197741).

Almost surely, 2^2565413665 is an apocalyptic number.

It is an amenable number.

2565413665 is a deficient number, since it is larger than the sum of its proper divisors (588168263).

2565413665 is a wasteful number, since it uses less digits than its factorization.

2565413665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12514259.

The product of its digits is 648000, while the sum is 43.

The square root of 2565413665 is about 50649.9127837354. The cubic root of 2565413665 is about 1368.9443739167.

The spelling of 2565413665 in words is "two billion, five hundred sixty-five million, four hundred thirteen thousand, six hundred sixty-five".