6881881388849 has 2 divisors, whose sum is σ = 6881881388850. Its totient is φ = 6881881388848.

The previous prime is 6881881388813. The next prime is 6881881388873. The reversal of 6881881388849 is 9488831881886.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4942031332624 + 1939850056225 = 2223068^2 + 1392785^2 .

It is a cyclic number.

It is not a de Polignac number, because 6881881388849 - 2⁸ = 6881881388593 is a prime.

It is a super-2 number, since 2×6881881388849² (a number of 26 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (6881881388149) 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, 3440940694424 + 3440940694425.

It is an arithmetic number, because the mean of its divisors is an integer number (3440940694425).

Almost surely, 2^{6881881388849} is an apocalyptic number.

It is an amenable number.

6881881388849 is a deficient number, since it is larger than the sum of its proper divisors (1).

6881881388849 is an equidigital number, since it uses as much as digits as its factorization.

6881881388849 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1358954496, while the sum is 80.

The spelling of 6881881388849 in words is "six trillion, eight hundred eighty-one billion, eight hundred eighty-one million, three hundred eighty-eight thousand, eight hundred forty-nine".