646342243646 has 64 divisors (see below), whose sum is σ = 1112918054400. Its totient is φ = 278795260800.

The previous prime is 646342243633. The next prime is 646342243681.

646342243646 is nontrivially palindromic in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 646342243594 and 646342243603.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 56775671 + ... + 56787053.

It is an arithmetic number, because the mean of its divisors is an integer number (17389344600).

Almost surely, 2^646342243646 is an apocalyptic number.

646342243646 is a deficient number, since it is larger than the sum of its proper divisors (466575810754).

646342243646 is a wasteful number, since it uses less digits than its factorization.

646342243646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12945.

The product of its digits is 11943936, while the sum is 50.

It can be divided in two parts, 646342 and 243646, that added together give a palindrome (889988).

The spelling of 646342243646 in words is "six hundred forty-six billion, three hundred forty-two million, two hundred forty-three thousand, six hundred forty-six".