2565668090 has 8 divisors (see below), whose sum is σ = 4618202580. Its totient is φ = 1026267232.

The previous prime is 2565668089. The next prime is 2565668093. The reversal of 2565668090 is 908665652.

It can be written as a sum of positive squares in 2 ways, for example, as 2096815681 + 468852409 = 45791^2 + 21653^2 .

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

It is not an unprimeable number, because it can be changed into a prime (2565668093) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 128283395 + ... + 128283414.

Almost surely, 2^2565668090 is an apocalyptic number.

2565668090 is a deficient number, since it is larger than the sum of its proper divisors (2052534490).

2565668090 is a wasteful number, since it uses less digits than its factorization.

2565668090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 256566816.

The product of its (nonzero) digits is 777600, while the sum is 47.

The square root of 2565668090 is about 50652.4243250015. The cubic root of 2565668090 is about 1368.9896274579.

The spelling of 2565668090 in words is "two billion, five hundred sixty-five million, six hundred sixty-eight thousand, ninety".