66206216 has 16 divisors (see below), whose sum is σ = 124338240. Its totient is φ = 33049360.

The previous prime is 66206171. The next prime is 66206219. The reversal of 66206216 is 61260266.

It is not an unprimeable number, because it can be changed into a prime (66206219) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1220 + ... + 11571.

It is an arithmetic number, because the mean of its divisors is an integer number (7771140).

Almost surely, 2^66206216 is an apocalyptic number.

It is an amenable number.

66206216 is a deficient number, since it is larger than the sum of its proper divisors (58132024).

66206216 is a wasteful number, since it uses less digits than its factorization.

66206216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13444 (or 13440 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 29.

The square root of 66206216 is about 8136.7202237757. The cubic root of 66206216 is about 404.5444575706.

The spelling of 66206216 in words is "sixty-six million, two hundred six thousand, two hundred sixteen".