6543340649 has 2 divisors, whose sum is σ = 6543340650. Its totient is φ = 6543340648.

The previous prime is 6543340589. The next prime is 6543340723. The reversal of 6543340649 is 9460433456.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3545011600 + 2998329049 = 59540^2 + 54757^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6543340649 is a prime.

It is not a weakly prime, because it can be changed into another prime (6543345649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3271670324 + 3271670325.

It is an arithmetic number, because the mean of its divisors is an integer number (3271670325).

Almost surely, 2^6543340649 is an apocalyptic number.

It is an amenable number.

6543340649 is a deficient number, since it is larger than the sum of its proper divisors (1).

6543340649 is an equidigital number, since it uses as much as digits as its factorization.

6543340649 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 933120, while the sum is 44.

The square root of 6543340649 is about 80890.9182108845. The cubic root of 6543340649 is about 1870.3943279871.

The spelling of 6543340649 in words is "six billion, five hundred forty-three million, three hundred forty thousand, six hundred forty-nine".