6557881717 has 2 divisors, whose sum is σ = 6557881718. Its totient is φ = 6557881716.

The previous prime is 6557881697. The next prime is 6557881723. The reversal of 6557881717 is 7171887556.

6557881717 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5541164721 + 1016716996 = 74439^2 + 31886^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6557881717 is a prime.

It is a super-2 number, since 2×6557881717² = 86011625228325736178, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6557881727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3278940858 + 3278940859.

It is an arithmetic number, because the mean of its divisors is an integer number (3278940859).

Almost surely, 2^6557881717 is an apocalyptic number.

It is an amenable number.

6557881717 is a deficient number, since it is larger than the sum of its proper divisors (1).

6557881717 is an equidigital number, since it uses as much as digits as its factorization.

6557881717 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3292800, while the sum is 55.

The square root of 6557881717 is about 80980.7490518580. The cubic root of 6557881717 is about 1871.7788098420.

The spelling of 6557881717 in words is "six billion, five hundred fifty-seven million, eight hundred eighty-one thousand, seven hundred seventeen".