6881561339 has 2 divisors, whose sum is σ = 6881561340. Its totient is φ = 6881561338.

The previous prime is 6881561333. The next prime is 6881561389. The reversal of 6881561339 is 9331651886.

It is a happy number.

It is an a-pointer prime, because the next prime (6881561389) can be obtained adding 6881561339 to its sum of digits (50).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6881561339 - 2²⁰ = 6880512763 is a prime.

It is not a weakly prime, because it can be changed into another prime (6881561333) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3440780669 + 3440780670.

It is an arithmetic number, because the mean of its divisors is an integer number (3440780670).

Almost surely, 2^6881561339 is an apocalyptic number.

6881561339 is a deficient number, since it is larger than the sum of its proper divisors (1).

6881561339 is an equidigital number, since it uses as much as digits as its factorization.

6881561339 is an evil number, because the sum of its binary digits is even.

The product of its digits is 933120, while the sum is 50.

The square root of 6881561339 is about 82955.1766859670. The cubic root of 6881561339 is about 1902.0809461743.

The spelling of 6881561339 in words is "six billion, eight hundred eighty-one million, five hundred sixty-one thousand, three hundred thirty-nine".