2556255551 has 4 divisors (see below), whose sum is σ = 2563376400. Its totient is φ = 2549134704.

The previous prime is 2556255523. The next prime is 2556255563. The reversal of 2556255551 is 1555526552.

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

It is a cyclic number.

It is not a de Polignac number, because 2556255551 - 2¹⁰ = 2556254527 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2556255499 and 2556255508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2556255521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3559886 + ... + 3560603.

It is an arithmetic number, because the mean of its divisors is an integer number (640844100).

Almost surely, 2^2556255551 is an apocalyptic number.

2556255551 is a deficient number, since it is larger than the sum of its proper divisors (7120849).

2556255551 is an equidigital number, since it uses as much as digits as its factorization.

2556255551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7120848.

The product of its digits is 375000, while the sum is 41.

The square root of 2556255551 is about 50559.4259362189. The cubic root of 2556255551 is about 1367.3134612935.

The spelling of 2556255551 in words is "two billion, five hundred fifty-six million, two hundred fifty-five thousand, five hundred fifty-one".