6668878049 has 2 divisors, whose sum is σ = 6668878050. Its totient is φ = 6668878048.

The previous prime is 6668878043. The next prime is 6668878063. The reversal of 6668878049 is 9408788666.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3403555600 + 3265322449 = 58340^2 + 57143^2 .

It is a cyclic number.

It is not a de Polignac number, because 6668878049 - 2⁴ = 6668878033 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 6668877982 and 6668878000.

It is not a weakly prime, because it can be changed into another prime (6668878043) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3334439024 + 3334439025.

It is an arithmetic number, because the mean of its divisors is an integer number (3334439025).

Almost surely, 2^6668878049 is an apocalyptic number.

It is an amenable number.

6668878049 is a deficient number, since it is larger than the sum of its proper divisors (1).

6668878049 is an equidigital number, since it uses as much as digits as its factorization.

6668878049 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27869184, while the sum is 62.

The square root of 6668878049 is about 81663.1988658294. The cubic root of 6668878049 is about 1882.2801338019.

The spelling of 6668878049 in words is "six billion, six hundred sixty-eight million, eight hundred seventy-eight thousand, forty-nine".