2555421265 has 4 divisors (see below), whose sum is σ = 3066505524. Its totient is φ = 2044337008.

The previous prime is 2555421263. The next prime is 2555421289. The reversal of 2555421265 is 5621245552.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 362559681 + 2192861584 = 19041^2 + 46828^2 .

It is a cyclic number.

It is not a de Polignac number, because 2555421265 - 2¹ = 2555421263 is a prime.

It is a super-2 number, since 2×2555421265² = 13060355683228400450, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2555421263) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 255542122 + ... + 255542131.

It is an arithmetic number, because the mean of its divisors is an integer number (766626381).

Almost surely, 2^2555421265 is an apocalyptic number.

It is an amenable number.

2555421265 is a deficient number, since it is larger than the sum of its proper divisors (511084259).

2555421265 is an equidigital number, since it uses as much as digits as its factorization.

2555421265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 511084258.

The product of its digits is 120000, while the sum is 37.

The square root of 2555421265 is about 50551.1747143427. The cubic root of 2555421265 is about 1367.1646949204.

The spelling of 2555421265 in words is "two billion, five hundred fifty-five million, four hundred twenty-one thousand, two hundred sixty-five".