216667117 has 8 divisors (see below), whose sum is σ = 217914552. Its totient is φ = 215424000.

The previous prime is 216667097. The next prime is 216667141. The reversal of 216667117 is 711766612.

It can be written as a sum of positive squares in 4 ways, for example, as 77686596 + 138980521 = 8814^2 + 11789^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-216667117 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216667177) 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, 158517 + ... + 159877.

It is an arithmetic number, because the mean of its divisors is an integer number (27239319).

Almost surely, 2^216667117 is an apocalyptic number.

It is an amenable number.

216667117 is a deficient number, since it is larger than the sum of its proper divisors (1247435).

216667117 is a wasteful number, since it uses less digits than its factorization.

216667117 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2159.

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

The square root of 216667117 is about 14719.6167409345. The cubic root of 216667117 is about 600.6170660908.

The spelling of 216667117 in words is "two hundred sixteen million, six hundred sixty-seven thousand, one hundred seventeen".