6882781649 has 2 divisors, whose sum is σ = 6882781650. Its totient is φ = 6882781648.

The previous prime is 6882781639. The next prime is 6882781663. The reversal of 6882781649 is 9461872886.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3926902225 + 2955879424 = 62665^2 + 54368^2 .

It is a cyclic number.

It is not a de Polignac number, because 6882781649 - 2²⁰ = 6881733073 is a prime.

It is a super-2 number, since 2×6882781649² = 94745366455622318402, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (6882781639) 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, 3441390824 + 3441390825.

It is an arithmetic number, because the mean of its divisors is an integer number (3441390825).

Almost surely, 2^6882781649 is an apocalyptic number.

It is an amenable number.

6882781649 is a deficient number, since it is larger than the sum of its proper divisors (1).

6882781649 is an equidigital number, since it uses as much as digits as its factorization.

6882781649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9289728, while the sum is 59.

The square root of 6882781649 is about 82962.5315971011. The cubic root of 6882781649 is about 1902.1933717851.

The spelling of 6882781649 in words is "six billion, eight hundred eighty-two million, seven hundred eighty-one thousand, six hundred forty-nine".