2556006155 has 4 divisors (see below), whose sum is σ = 3067207392. Its totient is φ = 2044804920.

The previous prime is 2556006149. The next prime is 2556006181. The reversal of 2556006155 is 5516006552.

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

It is not a de Polignac number, because 2556006155 - 2²⁰ = 2554957579 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 255600611 + ... + 255600620.

It is an arithmetic number, because the mean of its divisors is an integer number (766801848).

Almost surely, 2^2556006155 is an apocalyptic number.

2556006155 is a deficient number, since it is larger than the sum of its proper divisors (511201237).

2556006155 is an equidigital number, since it uses as much as digits as its factorization.

2556006155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 511201236.

The product of its (nonzero) digits is 45000, while the sum is 35.

The square root of 2556006155 is about 50556.9595110307. The cubic root of 2556006155 is about 1367.2689934392.

The spelling of 2556006155 in words is "two billion, five hundred fifty-six million, six thousand, one hundred fifty-five".