6556876813 has 2 divisors, whose sum is σ = 6556876814. Its totient is φ = 6556876812.

The previous prime is 6556876793. The next prime is 6556876831. The reversal of 6556876813 is 3186786556.

Together with next prime (6556876831) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6040087524 + 516789289 = 77718^2 + 22733^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6556876813 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6556876213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3278438406 + 3278438407.

It is an arithmetic number, because the mean of its divisors is an integer number (3278438407).

Almost surely, 2^6556876813 is an apocalyptic number.

It is an amenable number.

6556876813 is a deficient number, since it is larger than the sum of its proper divisors (1).

6556876813 is an equidigital number, since it uses as much as digits as its factorization.

6556876813 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7257600, while the sum is 55.

The square root of 6556876813 is about 80974.5442284179. The cubic root of 6556876813 is about 1871.6831969505.

The spelling of 6556876813 in words is "six billion, five hundred fifty-six million, eight hundred seventy-six thousand, eight hundred thirteen".