66414217 has 8 divisors (see below), whose sum is σ = 67149000. Its totient is φ = 65683584.

The previous prime is 66414211. The next prime is 66414239. The reversal of 66414217 is 71241466.

It can be written as a sum of positive squares in 4 ways, for example, as 2157961 + 64256256 = 1469^2 + 8016^2 .

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 66414217 - 2³ = 66414209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66414211) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39253 + ... + 40909.

It is an arithmetic number, because the mean of its divisors is an integer number (8393625).

Almost surely, 2^66414217 is an apocalyptic number.

It is an amenable number.

66414217 is a deficient number, since it is larger than the sum of its proper divisors (734783).

66414217 is a wasteful number, since it uses less digits than its factorization.

66414217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2075.

The product of its digits is 8064, while the sum is 31.

The square root of 66414217 is about 8149.4918246477. The cubic root of 66414217 is about 404.9676690139.

The spelling of 66414217 in words is "sixty-six million, four hundred fourteen thousand, two hundred seventeen".