66216716 has 12 divisors (see below), whose sum is σ = 118066032. Its totient is φ = 32483568.

The previous prime is 66216697. The next prime is 66216727. The reversal of 66216716 is 61761266.

66216716 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, 155960 + ... + 156383.

It is an arithmetic number, because the mean of its divisors is an integer number (9838836).

Almost surely, 2^66216716 is an apocalyptic number.

It is an amenable number.

66216716 is a deficient number, since it is larger than the sum of its proper divisors (51849316).

66216716 is a wasteful number, since it uses less digits than its factorization.

66216716 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 312400 (or 312398 counting only the distinct ones).

The product of its digits is 18144, while the sum is 35.

The square root of 66216716 is about 8137.3654213142. The cubic root of 66216716 is about 404.5658427342.

The spelling of 66216716 in words is "sixty-six million, two hundred sixteen thousand, seven hundred sixteen".