217116667 has 4 divisors (see below), whose sum is σ = 228543880. Its totient is φ = 205689456.

The previous prime is 217116661. The next prime is 217116719. The reversal of 217116667 is 766611712.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-217116667 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (217116661) 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, 5713578 + ... + 5713615.

It is an arithmetic number, because the mean of its divisors is an integer number (57135970).

Almost surely, 2^217116667 is an apocalyptic number.

217116667 is a deficient number, since it is larger than the sum of its proper divisors (11427213).

217116667 is a wasteful number, since it uses less digits than its factorization.

217116667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11427212.

The product of its digits is 21168, while the sum is 37.

The square root of 217116667 is about 14734.8792665566. The cubic root of 217116667 is about 601.0321742682.

The spelling of 217116667 in words is "two hundred seventeen million, one hundred sixteen thousand, six hundred sixty-seven".