646645546646 has 16 divisors (see below), whose sum is σ = 1058221011600. Its totient is φ = 293909306880.

The previous prime is 646645546637. The next prime is 646645546681.

646645546646 is nontrivially palindromic in base 10.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 699251 + ... + 1335006.

It is an arithmetic number, because the mean of its divisors is an integer number (66138813225).

Almost surely, 2^646645546646 is an apocalyptic number.

646645546646 is a deficient number, since it is larger than the sum of its proper divisors (411575464954).

646645546646 is a wasteful number, since it uses less digits than its factorization.

646645546646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2048719.

The product of its digits is 298598400, while the sum is 62.

The spelling of 646645546646 in words is "six hundred forty-six billion, six hundred forty-five million, five hundred forty-six thousand, six hundred forty-six".