664196644 has 6 divisors (see below), whose sum is σ = 1162344134. Its totient is φ = 332098320.

The previous prime is 664196629. The next prime is 664196671. The reversal of 664196644 is 446691466.

664196644 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 only one way, i.e., 598780900 + 65415744 = 24470^2 + 8088^2 .

It is a junction number, because it is equal to n+sod(n) for n = 664196594 and 664196603.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83024577 + ... + 83024584.

Almost surely, 2^664196644 is an apocalyptic number.

It is an amenable number.

664196644 is a deficient number, since it is larger than the sum of its proper divisors (498147490).

664196644 is a wasteful number, since it uses less digits than its factorization.

664196644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166049165 (or 166049163 counting only the distinct ones).

The product of its digits is 746496, while the sum is 46.

The square root of 664196644 is about 25772.0128045910. The cubic root of 664196644 is about 872.5002477811.

It can be divided in two parts, 6641 and 96644, that added together give a triangular number (103285 = T₄₅₄).

The spelling of 664196644 in words is "six hundred sixty-four million, one hundred ninety-six thousand, six hundred forty-four".