2556768887 has 2 divisors, whose sum is σ = 2556768888. Its totient is φ = 2556768886.

The previous prime is 2556768871. The next prime is 2556768899. The reversal of 2556768887 is 7888676552.

2556768887 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2556768887 - 2⁴ = 2556768871 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2556768817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1278384443 + 1278384444.

It is an arithmetic number, because the mean of its divisors is an integer number (1278384444).

Almost surely, 2^2556768887 is an apocalyptic number.

2556768887 is a deficient number, since it is larger than the sum of its proper divisors (1).

2556768887 is an equidigital number, since it uses as much as digits as its factorization.

2556768887 is an evil number, because the sum of its binary digits is even.

The product of its digits is 45158400, while the sum is 62.

The square root of 2556768887 is about 50564.5022421857. The cubic root of 2556768887 is about 1367.4049811267.

The spelling of 2556768887 in words is "two billion, five hundred fifty-six million, seven hundred sixty-eight thousand, eight hundred eighty-seven".