2565551788 has 12 divisors (see below), whose sum is σ = 4490172792. Its totient is φ = 1282645280.

The previous prime is 2565551783. The next prime is 2565551797. The reversal of 2565551788 is 8871555652.

It is not an unprimeable number, because it can be changed into a prime (2565551783) 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 3 ways as a sum of consecutive naturals, for example, 21531 + ... + 74797.

It is an arithmetic number, because the mean of its divisors is an integer number (374181066).

Almost surely, 2^2565551788 is an apocalyptic number.

It is an amenable number.

2565551788 is a deficient number, since it is larger than the sum of its proper divisors (1924621004).

2565551788 is a wasteful number, since it uses less digits than its factorization.

2565551788 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65312 (or 65310 counting only the distinct ones).

The product of its digits is 3360000, while the sum is 52.

The square root of 2565551788 is about 50651.2762721730. The cubic root of 2565551788 is about 1368.9689416648.

The spelling of 2565551788 in words is "two billion, five hundred sixty-five million, five hundred fifty-one thousand, seven hundred eighty-eight".