6404450849 has 2 divisors, whose sum is σ = 6404450850. Its totient is φ = 6404450848.

The previous prime is 6404450839. The next prime is 6404450881. The reversal of 6404450849 is 9480544046.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6402400225 + 2050624 = 80015^2 + 1432^2 .

It is a cyclic number.

It is not a de Polignac number, because 6404450849 - 2¹⁶ = 6404385313 is a prime.

It is not a weakly prime, because it can be changed into another prime (6404450839) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3202225424 + 3202225425.

It is an arithmetic number, because the mean of its divisors is an integer number (3202225425).

Almost surely, 2^6404450849 is an apocalyptic number.

It is an amenable number.

6404450849 is a deficient number, since it is larger than the sum of its proper divisors (1).

6404450849 is an equidigital number, since it uses as much as digits as its factorization.

6404450849 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 552960, while the sum is 44.

The square root of 6404450849 is about 80027.8129714914. The cubic root of 6404450849 is about 1857.0658297742.

The spelling of 6404450849 in words is "six billion, four hundred four million, four hundred fifty thousand, eight hundred forty-nine".