660026644 has 12 divisors (see below), whose sum is σ = 1155433300. Its totient is φ = 329902848.

The previous prime is 660026639. The next prime is 660026657. The reversal of 660026644 is 446620066.

660026644 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 2 ways, for example, as 568250244 + 91776400 = 23838^2 + 9580^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13359 + ... + 38710.

Almost surely, 2^660026644 is an apocalyptic number.

It is an amenable number.

660026644 is a deficient number, since it is larger than the sum of its proper divisors (495406656).

660026644 is a wasteful number, since it uses less digits than its factorization.

660026644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55242 (or 55240 counting only the distinct ones).

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

The square root of 660026644 is about 25690.9837102436. The cubic root of 660026644 is about 870.6704850366.

The spelling of 660026644 in words is "six hundred sixty million, twenty-six thousand, six hundred forty-four".