646444202444646 has 64 divisors (see below), whose sum is σ = 1361530715212800. Its totient is φ = 204050948666400.

The previous prime is 646444202444641. The next prime is 646444202444687.

It is a happy number.

646444202444646 is nontrivially palindromic in base 10.

It is a super-2 number, since 2×646444202444646² (a number of 30 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 646444202444646.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646444202444641) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 12294695985 + ... + 12294748563.

It is an arithmetic number, because the mean of its divisors is an integer number (21273917425200).

Almost surely, 2^{646444202444646} is an apocalyptic number.

646444202444646 is an abundant number, since it is smaller than the sum of its proper divisors (715086512768154).

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

646444202444646 is a wasteful number, since it uses less digits than its factorization.

646444202444646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97745.

The product of its (nonzero) digits is 339738624, while the sum is 60.

The spelling of 646444202444646 in words is "six hundred forty-six trillion, four hundred forty-four billion, two hundred two million, four hundred forty-four thousand, six hundred forty-six".