216662171 has 4 divisors (see below), whose sum is σ = 236358744. Its totient is φ = 196965600.

The previous prime is 216662153. The next prime is 216662189. The reversal of 216662171 is 171266612.

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

It is an interprime number because it is at equal distance from previous prime (216662153) and next prime (216662189).

It is a cyclic number.

It is not a de Polignac number, because 216662171 - 2¹⁴ = 216645787 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216662141) 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, 9848270 + ... + 9848291.

It is an arithmetic number, because the mean of its divisors is an integer number (59089686).

Almost surely, 2^216662171 is an apocalyptic number.

216662171 is a deficient number, since it is larger than the sum of its proper divisors (19696573).

216662171 is a wasteful number, since it uses less digits than its factorization.

216662171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19696572.

The product of its digits is 6048, while the sum is 32.

The square root of 216662171 is about 14719.4487328840. The cubic root of 216662171 is about 600.6124958316.

The spelling of 216662171 in words is "two hundred sixteen million, six hundred sixty-two thousand, one hundred seventy-one".