2556506155 has 24 divisors (see below), whose sum is σ = 3778602048. Its totient is φ = 1649910528.

The previous prime is 2556506093. The next prime is 2556506177. The reversal of 2556506155 is 5516056552.

It is not a de Polignac number, because 2556506155 - 2⁷ = 2556506027 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 302739 + ... + 311068.

It is an arithmetic number, because the mean of its divisors is an integer number (157441752).

Almost surely, 2^2556506155 is an apocalyptic number.

2556506155 is a deficient number, since it is larger than the sum of its proper divisors (1222095893).

2556506155 is a wasteful number, since it uses less digits than its factorization.

2556506155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 613843 (or 613836 counting only the distinct ones).

The product of its (nonzero) digits is 225000, while the sum is 40.

The square root of 2556506155 is about 50561.9041868480. The cubic root of 2556506155 is about 1367.3581416236.

The spelling of 2556506155 in words is "two billion, five hundred fifty-six million, five hundred six thousand, one hundred fifty-five".