6656877517 has 2 divisors, whose sum is σ = 6656877518. Its totient is φ = 6656877516.

The previous prime is 6656877499. The next prime is 6656877523. The reversal of 6656877517 is 7157786566.

6656877517 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., 5436702756 + 1220174761 = 73734^2 + 34931^2 .

It is a cyclic number.

It is not a de Polignac number, because 6656877517 - 2⁷ = 6656877389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6656874517) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3328438758 + 3328438759.

It is an arithmetic number, because the mean of its divisors is an integer number (3328438759).

Almost surely, 2^6656877517 is an apocalyptic number.

It is an amenable number.

6656877517 is a deficient number, since it is larger than the sum of its proper divisors (1).

6656877517 is an equidigital number, since it uses as much as digits as its factorization.

6656877517 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 14817600, while the sum is 58.

The square root of 6656877517 is about 81589.6900165701. The cubic root of 6656877517 is about 1881.1504122556.

The spelling of 6656877517 in words is "six billion, six hundred fifty-six million, eight hundred seventy-seven thousand, five hundred seventeen".