66216606 has 32 divisors (see below), whose sum is σ = 136544640. Its totient is φ = 21391776.

The previous prime is 66216593. The next prime is 66216607. The reversal of 66216606 is 60661266.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66216607) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 83745 + ... + 84531.

It is an arithmetic number, because the mean of its divisors is an integer number (4267020).

Almost surely, 2^66216606 is an apocalyptic number.

66216606 is an abundant number, since it is smaller than the sum of its proper divisors (70328034).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66216606 is a wasteful number, since it uses less digits than its factorization.

66216606 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1208.

The product of its (nonzero) digits is 15552, while the sum is 33.

The square root of 66216606 is about 8137.3586623670. The cubic root of 66216606 is about 404.5656187108.

The spelling of 66216606 in words is "sixty-six million, two hundred sixteen thousand, six hundred six".