6881555687 has 2 divisors, whose sum is σ = 6881555688. Its totient is φ = 6881555686.

The previous prime is 6881555663. The next prime is 6881555689. The reversal of 6881555687 is 7865551886.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6881555687 - 2⁶ = 6881555623 is a prime.

Together with 6881555689, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6881555689) 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, 3440777843 + 3440777844.

It is an arithmetic number, because the mean of its divisors is an integer number (3440777844).

Almost surely, 2^6881555687 is an apocalyptic number.

6881555687 is a deficient number, since it is larger than the sum of its proper divisors (1).

6881555687 is an equidigital number, since it uses as much as digits as its factorization.

6881555687 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16128000, while the sum is 59.

The square root of 6881555687 is about 82955.1426193699. The cubic root of 6881555687 is about 1902.0804254318.

The spelling of 6881555687 in words is "six billion, eight hundred eighty-one million, five hundred fifty-five thousand, six hundred eighty-seven".