663601444 has 48 divisors (see below), whose sum is σ = 1295058240. Its totient is φ = 295004160.

The previous prime is 663601439. The next prime is 663601447. The reversal of 663601444 is 444106366.

It is not an unprimeable number, because it can be changed into a prime (663601447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 378979 + ... + 380725.

It is an arithmetic number, because the mean of its divisors is an integer number (26980380).

Almost surely, 2^663601444 is an apocalyptic number.

It is an amenable number.

663601444 is a deficient number, since it is larger than the sum of its proper divisors (631456796).

663601444 is a wasteful number, since it uses less digits than its factorization.

663601444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1948 (or 1946 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 34.

The square root of 663601444 is about 25760.4628064016. The cubic root of 663601444 is about 872.2395482070.

The spelling of 663601444 in words is "six hundred sixty-three million, six hundred one thousand, four hundred forty-four".