66665214 has 64 divisors (see below), whose sum is σ = 184711680. Its totient is φ = 17314560.

The previous prime is 66665213. The next prime is 66665227. The reversal of 66665214 is 41256666.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66665213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3859 + ... + 12174.

It is an arithmetic number, because the mean of its divisors is an integer number (2886120).

Almost surely, 2^66665214 is an apocalyptic number.

66665214 is an abundant number, since it is smaller than the sum of its proper divisors (118046466).

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

66665214 is a wasteful number, since it uses less digits than its factorization.

66665214 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16062 (or 16056 counting only the distinct ones).

The product of its digits is 51840, while the sum is 36.

The square root of 66665214 is about 8164.8768514902. The cubic root of 66665214 is about 405.4771878795.

It can be divided in two parts, 666652 and 14, that added together give a palindrome (666666).

The spelling of 66665214 in words is "sixty-six million, six hundred sixty-five thousand, two hundred fourteen".