6428005665 has 16 divisors (see below), whose sum is σ = 10321416576. Its totient is φ = 3416067200.

The previous prime is 6428005637. The next prime is 6428005667. The reversal of 6428005665 is 5665008246.

It is not a de Polignac number, because 6428005665 - 2⁷ = 6428005537 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6428005667) 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 in 15 ways as a sum of consecutive naturals, for example, 758301 + ... + 766730.

It is an arithmetic number, because the mean of its divisors is an integer number (645088536).

Almost surely, 2^6428005665 is an apocalyptic number.

It is an amenable number.

6428005665 is a deficient number, since it is larger than the sum of its proper divisors (3893410911).

6428005665 is a wasteful number, since it uses less digits than its factorization.

6428005665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1525320.

The product of its (nonzero) digits is 345600, while the sum is 42.

The square root of 6428005665 is about 80174.8443403540. The cubic root of 6428005665 is about 1859.3397341389.

The spelling of 6428005665 in words is "six billion, four hundred twenty-eight million, five thousand, six hundred sixty-five".