6640876849 has 2 divisors, whose sum is σ = 6640876850. Its totient is φ = 6640876848.

The previous prime is 6640876829. The next prime is 6640876859. The reversal of 6640876849 is 9486780466.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4073630625 + 2567246224 = 63825^2 + 50668^2 .

It is a cyclic number.

It is not a de Polignac number, because 6640876849 - 2¹⁷ = 6640745777 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 6640876793 and 6640876802.

It is not a weakly prime, because it can be changed into another prime (6640876819) 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, 3320438424 + 3320438425.

It is an arithmetic number, because the mean of its divisors is an integer number (3320438425).

Almost surely, 2^6640876849 is an apocalyptic number.

It is an amenable number.

6640876849 is a deficient number, since it is larger than the sum of its proper divisors (1).

6640876849 is an equidigital number, since it uses as much as digits as its factorization.

6640876849 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13934592, while the sum is 58.

The square root of 6640876849 is about 81491.5753253059. The cubic root of 6640876849 is about 1879.6420067742.

The spelling of 6640876849 in words is "six billion, six hundred forty million, eight hundred seventy-six thousand, eight hundred forty-nine".