2565519985 has 32 divisors (see below), whose sum is σ = 3545233920. Its totient is φ = 1745874432.

The previous prime is 2565519977. The next prime is 2565519989. The reversal of 2565519985 is 5899155652.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 2565519985 - 2³ = 2565519977 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2565519989) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3964932 + ... + 3965578.

It is an arithmetic number, because the mean of its divisors is an integer number (110788560).

Almost surely, 2^2565519985 is an apocalyptic number.

It is an amenable number.

2565519985 is a deficient number, since it is larger than the sum of its proper divisors (979713935).

2565519985 is a wasteful number, since it uses less digits than its factorization.

2565519985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1345.

The product of its digits is 4860000, while the sum is 55.

The square root of 2565519985 is about 50650.9623304434. The cubic root of 2565519985 is about 1368.9632849871.

The spelling of 2565519985 in words is "two billion, five hundred sixty-five million, five hundred nineteen thousand, nine hundred eighty-five".