2556506553 has 4 divisors (see below), whose sum is σ = 3408675408. Its totient is φ = 1704337700.

The previous prime is 2556506549. The next prime is 2556506573. The reversal of 2556506553 is 3556056552.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2556506553 - 2² = 2556506549 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2556506503) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 426084423 + ... + 426084428.

It is an arithmetic number, because the mean of its divisors is an integer number (852168852).

Almost surely, 2^2556506553 is an apocalyptic number.

It is an amenable number.

2556506553 is a deficient number, since it is larger than the sum of its proper divisors (852168855).

2556506553 is an equidigital number, since it uses as much as digits as its factorization.

2556506553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 852168854.

The product of its (nonzero) digits is 675000, while the sum is 42.

The square root of 2556506553 is about 50561.9081226174. The cubic root of 2556506553 is about 1367.3582125810.

The spelling of 2556506553 in words is "two billion, five hundred fifty-six million, five hundred six thousand, five hundred fifty-three".