66466217 has 4 divisors (see below), whose sum is σ = 66624516. Its totient is φ = 66307920.

The previous prime is 66466193. The next prime is 66466219. The reversal of 66466217 is 71266466.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 9554281 + 56911936 = 3091^2 + 7544^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66466217 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66466219) 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, 78518 + ... + 79359.

It is an arithmetic number, because the mean of its divisors is an integer number (16656129).

Almost surely, 2^66466217 is an apocalyptic number.

It is an amenable number.

66466217 is a deficient number, since it is larger than the sum of its proper divisors (158299).

66466217 is a wasteful number, since it uses less digits than its factorization.

66466217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 158298.

The product of its digits is 72576, while the sum is 38.

The square root of 66466217 is about 8152.6815833810. The cubic root of 66466217 is about 405.0733332635.

The spelling of 66466217 in words is "sixty-six million, four hundred sixty-six thousand, two hundred seventeen".