66203216 has 10 divisors (see below), whose sum is σ = 128268762. Its totient is φ = 33101600.

The previous prime is 66203183. The next prime is 66203237. The reversal of 66203216 is 61230266.

66203216 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., 37258816 + 28944400 = 6104^2 + 5380^2 .

It is a congruent number.

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 as a sum of consecutive naturals, namely, 2068835 + ... + 2068866.

Almost surely, 2^66203216 is an apocalyptic number.

It is an amenable number.

66203216 is a deficient number, since it is larger than the sum of its proper divisors (62065546).

66203216 is a wasteful number, since it uses less digits than its factorization.

66203216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4137709 (or 4137703 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 26.

The square root of 66203216 is about 8136.5358722247. The cubic root of 66203216 is about 404.5383471086.

The spelling of 66203216 in words is "sixty-six million, two hundred three thousand, two hundred sixteen".