2556779911 has 16 divisors (see below), whose sum is σ = 2935595520. Its totient is φ = 2181382560.

The previous prime is 2556779903. The next prime is 2556779917. The reversal of 2556779911 is 1199776552.

2556779911 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 2556779911 - 2³ = 2556779903 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2556779917) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2632656 + ... + 2633626.

It is an arithmetic number, because the mean of its divisors is an integer number (183474720).

Almost surely, 2^2556779911 is an apocalyptic number.

2556779911 is a deficient number, since it is larger than the sum of its proper divisors (378815609).

2556779911 is an equidigital number, since it uses as much as digits as its factorization.

2556779911 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2334.

The product of its digits is 1190700, while the sum is 52.

The square root of 2556779911 is about 50564.6112513485. The cubic root of 2556779911 is about 1367.4069464002.

The spelling of 2556779911 in words is "two billion, five hundred fifty-six million, seven hundred seventy-nine thousand, nine hundred eleven".