2565991382 has 16 divisors (see below), whose sum is σ = 4052559600. Its totient is φ = 1215171360.

The previous prime is 2565991357. The next prime is 2565991399. The reversal of 2565991382 is 2831995652.

It is a self number, because there is not a number n which added to its sum of digits gives 2565991382.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 270032 + ... + 279372.

It is an arithmetic number, because the mean of its divisors is an integer number (253284975).

Almost surely, 2^2565991382 is an apocalyptic number.

2565991382 is a deficient number, since it is larger than the sum of its proper divisors (1486568218).

2565991382 is a wasteful number, since it uses less digits than its factorization.

2565991382 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16591.

The product of its digits is 1166400, while the sum is 50.

The square root of 2565991382 is about 50655.6155031207. The cubic root of 2565991382 is about 1369.0471257768.

The spelling of 2565991382 in words is "two billion, five hundred sixty-five million, nine hundred ninety-one thousand, three hundred eighty-two".