6405920659 has 2 divisors, whose sum is σ = 6405920660. Its totient is φ = 6405920658.

The previous prime is 6405920629. The next prime is 6405920669. The reversal of 6405920659 is 9560295046.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6405920659 - 2⁵ = 6405920627 is a prime.

It is not a weakly prime, because it can be changed into another prime (6405920629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3202960329 + 3202960330.

It is an arithmetic number, because the mean of its divisors is an integer number (3202960330).

Almost surely, 2^6405920659 is an apocalyptic number.

6405920659 is a deficient number, since it is larger than the sum of its proper divisors (1).

6405920659 is an equidigital number, since it uses as much as digits as its factorization.

6405920659 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 583200, while the sum is 46.

The square root of 6405920659 is about 80036.9955645513. The cubic root of 6405920659 is about 1857.2078833351.

The spelling of 6405920659 in words is "six billion, four hundred five million, nine hundred twenty thousand, six hundred fifty-nine".