646144441646 has 16 divisors (see below), whose sum is σ = 1081916275968. Its totient is φ = 286871739000.

The previous prime is 646144441601. The next prime is 646144441711.

646144441646 is nontrivially palindromic in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 646144441594 and 646144441603.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 341513030 + ... + 341514921.

It is an arithmetic number, because the mean of its divisors is an integer number (67619767248).

Almost surely, 2^646144441646 is an apocalyptic number.

646144441646 is a deficient number, since it is larger than the sum of its proper divisors (435771834322).

646144441646 is a wasteful number, since it uses less digits than its factorization.

646144441646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 683028007.

The product of its digits is 5308416, while the sum is 50.

The spelling of 646144441646 in words is "six hundred forty-six billion, one hundred forty-four million, four hundred forty-one thousand, six hundred forty-six".