2555605809 has 45 divisors (see below), whose sum is σ = 3941788081. Its totient is φ = 1650049920.

The previous prime is 2555605783. The next prime is 2555605841. The reversal of 2555605809 is 9085065552.

The square root of 2555605809 is 50553.

It is a perfect power (a square), and thus also a powerful number.

2555605809 is a `hidden beast` number, since 2 + 5 + 5 + 5 + 60 + 580 + 9 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 537080625 + 2018525184 = 23175^2 + 44928^2 .

It is not a de Polignac number, because 2555605809 - 2¹⁷ = 2555474737 is a prime.

It is a super-2 number, since 2×2555605809² = 13062242101989088962, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2555605859) by changing a digit.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 18653989 + ... + 18654125.

Almost surely, 2^2555605809 is an apocalyptic number.

2555605809 is the 50553-rd square number.

2555605809 is the 25277-th centered octagonal number.

It is an amenable number.

2555605809 is a deficient number, since it is larger than the sum of its proper divisors (1386182272).

2555605809 is an frugal number, since it uses more digits than its factorization.

2555605809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 368 (or 181 counting only the distinct ones).

The product of its (nonzero) digits is 540000, while the sum is 45.

The cubic root of 2555605809 is about 1367.1976048195.

The spelling of 2555605809 in words is "two billion, five hundred fifty-five million, six hundred five thousand, eight hundred nine".