6648668449 has 2 divisors, whose sum is σ = 6648668450. Its totient is φ = 6648668448.

The previous prime is 6648668321. The next prime is 6648668479. The reversal of 6648668449 is 9448668466.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6602700049 + 45968400 = 81257^2 + 6780^2 .

It is a cyclic number.

It is not a de Polignac number, because 6648668449 - 2⁷ = 6648668321 is a prime.

It is not a weakly prime, because it can be changed into another prime (6648668479) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3324334224 + 3324334225.

It is an arithmetic number, because the mean of its divisors is an integer number (3324334225).

Almost surely, 2^6648668449 is an apocalyptic number.

It is an amenable number.

6648668449 is a deficient number, since it is larger than the sum of its proper divisors (1).

6648668449 is an equidigital number, since it uses as much as digits as its factorization.

6648668449 is an evil number, because the sum of its binary digits is even.

The product of its digits is 47775744, while the sum is 61.

The square root of 6648668449 is about 81539.3674797640. The cubic root of 6648668449 is about 1880.3768341674.

The spelling of 6648668449 in words is "six billion, six hundred forty-eight million, six hundred sixty-eight thousand, four hundred forty-nine".