66210244 has 12 divisors (see below), whose sum is σ = 118694268. Its totient is φ = 32297600.

The previous prime is 66210191. The next prime is 66210251. The reversal of 66210244 is 44201266.

66210244 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 25887744 + 40322500 = 5088^2 + 6350^2 .

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 201697 + ... + 202024.

It is an arithmetic number, because the mean of its divisors is an integer number (9891189).

Almost surely, 2^66210244 is an apocalyptic number.

It is an amenable number.

66210244 is a deficient number, since it is larger than the sum of its proper divisors (52484024).

66210244 is a wasteful number, since it uses less digits than its factorization.

66210244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 403766 (or 403764 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 25.

The square root of 66210244 is about 8136.9677398894. The cubic root of 66210244 is about 404.5526615940.

The spelling of 66210244 in words is "sixty-six million, two hundred ten thousand, two hundred forty-four".