6881555689 has 2 divisors, whose sum is σ = 6881555690. Its totient is φ = 6881555688.

The previous prime is 6881555687. The next prime is 6881555719. The reversal of 6881555689 is 9865551886.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3755851225 + 3125704464 = 61285^2 + 55908^2 .

It is a cyclic number.

It is not a de Polignac number, because 6881555689 - 2¹ = 6881555687 is a prime.

Together with 6881555687, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (6881555687) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3440777844 + 3440777845.

It is an arithmetic number, because the mean of its divisors is an integer number (3440777845).

Almost surely, 2^6881555689 is an apocalyptic number.

It is an amenable number.

6881555689 is a deficient number, since it is larger than the sum of its proper divisors (1).

6881555689 is an equidigital number, since it uses as much as digits as its factorization.

6881555689 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20736000, while the sum is 61.

The square root of 6881555689 is about 82955.1426314246. The cubic root of 6881555689 is about 1902.0804256161.

The spelling of 6881555689 in words is "six billion, eight hundred eighty-one million, five hundred fifty-five thousand, six hundred eighty-nine".