6405765539 has 2 divisors, whose sum is σ = 6405765540. Its totient is φ = 6405765538.

The previous prime is 6405765511. The next prime is 6405765551. The reversal of 6405765539 is 9355675046.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6405765539 - 2⁸ = 6405765283 is a prime.

It is not a weakly prime, because it can be changed into another prime (6405765589) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3202882769 + 3202882770.

It is an arithmetic number, because the mean of its divisors is an integer number (3202882770).

Almost surely, 2^6405765539 is an apocalyptic number.

6405765539 is a deficient number, since it is larger than the sum of its proper divisors (1).

6405765539 is an equidigital number, since it uses as much as digits as its factorization.

6405765539 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3402000, while the sum is 50.

The square root of 6405765539 is about 80036.0265068175. The cubic root of 6405765539 is about 1857.1928923902.

The spelling of 6405765539 in words is "six billion, four hundred five million, seven hundred sixty-five thousand, five hundred thirty-nine".