2555128565 has 12 divisors (see below), whose sum is σ = 3370236492. Its totient is φ = 1858274880.

The previous prime is 2555128559. The next prime is 2555128579. The reversal of 2555128565 is 5658215552.

It can be written as a sum of positive squares in 2 ways, for example, as 1749079684 + 806048881 = 41822^2 + 28391^2 .

It is not a de Polignac number, because 2555128565 - 2²⁰ = 2554079989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2111072 + ... + 2112281.

It is an arithmetic number, because the mean of its divisors is an integer number (280853041).

Almost surely, 2^2555128565 is an apocalyptic number.

It is an amenable number.

2555128565 is a deficient number, since it is larger than the sum of its proper divisors (815107927).

2555128565 is a wasteful number, since it uses less digits than its factorization.

2555128565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4223380 (or 4223369 counting only the distinct ones).

The product of its digits is 600000, while the sum is 44.

The square root of 2555128565 is about 50548.2795454009. The cubic root of 2555128565 is about 1367.1124942140.

The spelling of 2555128565 in words is "two billion, five hundred fifty-five million, one hundred twenty-eight thousand, five hundred sixty-five".