646424424646 has 64 divisors (see below), whose sum is σ = 1309686174720. Its totient is φ = 231088095360.

The previous prime is 646424424637. The next prime is 646424424697.

646424424646 is nontrivially palindromic in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 646424424593 and 646424424602.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 632401 + ... + 1301068.

It is an arithmetic number, because the mean of its divisors is an integer number (20463846480).

Almost surely, 2^646424424646 is an apocalyptic number.

646424424646 is an abundant number, since it is smaller than the sum of its proper divisors (663261750074).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

646424424646 is a wasteful number, since it uses less digits than its factorization.

646424424646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1933669.

The product of its digits is 21233664, while the sum is 52.

The spelling of 646424424646 in words is "six hundred forty-six billion, four hundred twenty-four million, four hundred twenty-four thousand, six hundred forty-six".