66216485 has 4 divisors (see below), whose sum is σ = 79459788. Its totient is φ = 52973184.

The previous prime is 66216461. The next prime is 66216499. The reversal of 66216485 is 58461266.

66216485 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 50708641 + 15507844 = 7121^2 + 3938^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66216485 is a prime.

It is a Duffinian number.

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 in 3 ways as a sum of consecutive naturals, for example, 6621644 + ... + 6621653.

It is an arithmetic number, because the mean of its divisors is an integer number (19864947).

Almost surely, 2^66216485 is an apocalyptic number.

It is an amenable number.

66216485 is a deficient number, since it is larger than the sum of its proper divisors (13243303).

66216485 is a wasteful number, since it uses less digits than its factorization.

66216485 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13243302.

The product of its digits is 69120, while the sum is 38.

The square root of 66216485 is about 8137.3512275187. The cubic root of 66216485 is about 404.5653722849.

The spelling of 66216485 in words is "sixty-six million, two hundred sixteen thousand, four hundred eighty-five".