66814217 has 8 divisors (see below), whose sum is σ = 68492160. Its totient is φ = 65142000.

The previous prime is 66814201. The next prime is 66814229. The reversal of 66814217 is 71241866.

66814217 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 66814217 - 2⁴ = 66814201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66814247) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 31259 + ... + 33327.

It is an arithmetic number, because the mean of its divisors is an integer number (8561520).

Almost surely, 2^66814217 is an apocalyptic number.

It is an amenable number.

66814217 is a deficient number, since it is larger than the sum of its proper divisors (1677943).

66814217 is a wasteful number, since it uses less digits than its factorization.

66814217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2863.

The product of its digits is 16128, while the sum is 35.

The square root of 66814217 is about 8173.9963909950. The cubic root of 66814217 is about 405.7790562594.

The spelling of 66814217 in words is "sixty-six million, eight hundred fourteen thousand, two hundred seventeen".