66217673 has 4 divisors (see below), whose sum is σ = 66739200. Its totient is φ = 65696148.

The previous prime is 66217651. The next prime is 66217687. The reversal of 66217673 is 37671266.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66217673 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66217633) 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, 260573 + ... + 260826.

It is an arithmetic number, because the mean of its divisors is an integer number (16684800).

Almost surely, 2^66217673 is an apocalyptic number.

It is an amenable number.

66217673 is a deficient number, since it is larger than the sum of its proper divisors (521527).

66217673 is a wasteful number, since it uses less digits than its factorization.

66217673 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 521526.

The product of its digits is 63504, while the sum is 38.

The square root of 66217673 is about 8137.4242239175. The cubic root of 66217673 is about 404.5677917266.

The spelling of 66217673 in words is "sixty-six million, two hundred seventeen thousand, six hundred seventy-three".