6645608065466 has 16 divisors (see below), whose sum is σ = 10588085162856. Its totient is φ = 3117479525376.

The previous prime is 6645608065463. The next prime is 6645608065471.

It is a happy number.

6645608065466 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in 4 ways, for example, as 3951233548441 + 2694374517025 = 1987771^2 + 1641455^2 .

It is a junction number, because it is equal to n+sod(n) for n = 6645608065399 and 6645608065408.

It is not an unprimeable number, because it can be changed into a prime (6645608065463) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 308284271 + ... + 308305826.

Almost surely, 2^{6645608065466} is an apocalyptic number.

6645608065466 is a deficient number, since it is larger than the sum of its proper divisors (3942477097390).

6645608065466 is a wasteful number, since it uses less digits than its factorization.

6645608065466 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 616590433.

The product of its (nonzero) digits is 149299200, while the sum is 62.

The spelling of 6645608065466 in words is "six trillion, six hundred forty-five billion, six hundred eight million, sixty-five thousand, four hundred sixty-six".