6646560649 has 2 divisors, whose sum is σ = 6646560650. Its totient is φ = 6646560648.

The previous prime is 6646560643. The next prime is 6646560653. The reversal of 6646560649 is 9460656466.

6646560649 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4269315600 + 2377245049 = 65340^2 + 48757^2 .

It is a cyclic number.

It is not a de Polignac number, because 6646560649 - 2¹¹ = 6646558601 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 6646560596 and 6646560605.

It is not a weakly prime, because it can be changed into another prime (6646560643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3323280324 + 3323280325.

It is an arithmetic number, because the mean of its divisors is an integer number (3323280325).

Almost surely, 2^6646560649 is an apocalyptic number.

It is an amenable number.

6646560649 is a deficient number, since it is larger than the sum of its proper divisors (1).

6646560649 is an equidigital number, since it uses as much as digits as its factorization.

6646560649 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5598720, while the sum is 52.

The square root of 6646560649 is about 81526.4414101339. The cubic root of 6646560649 is about 1880.1781037883.

The spelling of 6646560649 in words is "six billion, six hundred forty-six million, five hundred sixty thousand, six hundred forty-nine".