6404767709 has 2 divisors, whose sum is σ = 6404767710. Its totient is φ = 6404767708.

The previous prime is 6404767693. The next prime is 6404767729. The reversal of 6404767709 is 9077674046.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3885028900 + 2519738809 = 62330^2 + 50197^2 .

It is a cyclic number.

It is not a de Polignac number, because 6404767709 - 2⁴ = 6404767693 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6404767729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3202383854 + 3202383855.

It is an arithmetic number, because the mean of its divisors is an integer number (3202383855).

Almost surely, 2^6404767709 is an apocalyptic number.

It is an amenable number.

6404767709 is a deficient number, since it is larger than the sum of its proper divisors (1).

6404767709 is an equidigital number, since it uses as much as digits as its factorization.

6404767709 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1778112, while the sum is 50.

The square root of 6404767709 is about 80029.7926337436. The cubic root of 6404767709 is about 1857.0964553599.

The spelling of 6404767709 in words is "six billion, four hundred four million, seven hundred sixty-seven thousand, seven hundred nine".