66430216 has 8 divisors (see below), whose sum is σ = 124556670. Its totient is φ = 33215104.

The previous prime is 66430211. The next prime is 66430229. The reversal of 66430216 is 61203466.

66430216 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., 66357316 + 72900 = 8146^2 + 270^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (66430211) 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 as a sum of consecutive naturals, namely, 4151881 + ... + 4151896.

Almost surely, 2^66430216 is an apocalyptic number.

It is an amenable number.

66430216 is a deficient number, since it is larger than the sum of its proper divisors (58126454).

66430216 is a wasteful number, since it uses less digits than its factorization.

66430216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8303783 (or 8303779 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 28.

The square root of 66430216 is about 8150.4733604865. The cubic root of 66430216 is about 405.0001849311. Note that the first 3 decimals are identical.

The spelling of 66430216 in words is "sixty-six million, four hundred thirty thousand, two hundred sixteen".