646223164144 has 20 divisors (see below), whose sum is σ = 1252073143440. Its totient is φ = 323107514240.

The previous prime is 646223164109. The next prime is 646223164159. The reversal of 646223164144 is 441461322646.

It is a self number, because there is not a number n which added to its sum of digits gives 646223164144.

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 3 ways as a sum of consecutive naturals, for example, 1371324 + ... + 1781284.

It is an arithmetic number, because the mean of its divisors is an integer number (62603657172).

Almost surely, 2^646223164144 is an apocalyptic number.

It is an amenable number.

646223164144 is a deficient number, since it is larger than the sum of its proper divisors (605849979296).

646223164144 is a wasteful number, since it uses less digits than its factorization.

646223164144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 508488 (or 508482 counting only the distinct ones).

The product of its digits is 663552, while the sum is 43.

The spelling of 646223164144 in words is "six hundred forty-six billion, two hundred twenty-three million, one hundred sixty-four thousand, one hundred forty-four".