667170217 has 8 divisors (see below), whose sum is σ = 778703616. Its totient is φ = 559692672.

The previous prime is 667170211. The next prime is 667170227. The reversal of 667170217 is 712071766.

667170217 is nontrivially palindromic in base 5.

667170217 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 not a de Polignac number, because 667170217 - 2¹⁹ = 666645929 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (667170211) 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, 1013608 + ... + 1014265.

It is an arithmetic number, because the mean of its divisors is an integer number (97337952).

Almost surely, 2^667170217 is an apocalyptic number.

It is an amenable number.

667170217 is a deficient number, since it is larger than the sum of its proper divisors (111533399).

667170217 is a wasteful number, since it uses less digits than its factorization.

667170217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2027927.

The product of its (nonzero) digits is 24696, while the sum is 37.

The square root of 667170217 is about 25829.6383443516. The cubic root of 667170217 is about 873.8003552497.

The spelling of 667170217 in words is "six hundred sixty-seven million, one hundred seventy thousand, two hundred seventeen".