664444244516 has 24 divisors (see below), whose sum is σ = 1252244253624. Its totient is φ = 306661086720.

The previous prime is 664444244507. The next prime is 664444244543. The reversal of 664444244516 is 615442444466.

664444244516 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 561500416 + 663882744100 = 23696^2 + 814790^2 .

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, 4989356 + ... + 5120796.

It is an arithmetic number, because the mean of its divisors is an integer number (52176843901).

Almost surely, 2^664444244516 is an apocalyptic number.

It is an amenable number.

664444244516 is a deficient number, since it is larger than the sum of its proper divisors (587800009108).

664444244516 is a wasteful number, since it uses less digits than its factorization.

664444244516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 228671 (or 228669 counting only the distinct ones).

The product of its digits is 8847360, while the sum is 50.

The spelling of 664444244516 in words is "six hundred sixty-four billion, four hundred forty-four million, two hundred forty-four thousand, five hundred sixteen".