6446656685017 has 4 divisors (see below), whose sum is σ = 6446686504356. Its totient is φ = 6446626865680.

The previous prime is 6446656684981. The next prime is 6446656685033. The reversal of 6446656685017 is 7105866566446.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5510375961561 + 936280723456 = 2347419^2 + 967616^2 .

It is a cyclic number.

It is not a de Polignac number, because 6446656685017 - 2²⁷ = 6446522467289 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 6446656685017.

It is not an unprimeable number, because it can be changed into a prime (6446656685617) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14582998 + ... + 15018559.

It is an arithmetic number, because the mean of its divisors is an integer number (1611671626089).

Almost surely, 2^{6446656685017} is an apocalyptic number.

It is an amenable number.

6446656685017 is a deficient number, since it is larger than the sum of its proper divisors (29819339).

6446656685017 is a wasteful number, since it uses less digits than its factorization.

6446656685017 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29819338.

The product of its (nonzero) digits is 174182400, while the sum is 64.

The spelling of 6446656685017 in words is "six trillion, four hundred forty-six billion, six hundred fifty-six million, six hundred eighty-five thousand, seventeen".