216389166 has 32 divisors (see below), whose sum is σ = 496696320. Its totient is φ = 61563936.

The previous prime is 216389161. The next prime is 216389177. The reversal of 216389166 is 661983612.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216389161) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 741 + ... + 20816.

It is an arithmetic number, because the mean of its divisors is an integer number (15521760).

Almost surely, 2^216389166 is an apocalyptic number.

216389166 is an abundant number, since it is smaller than the sum of its proper divisors (280307154).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

216389166 is a wasteful number, since it uses less digits than its factorization.

216389166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21808.

The product of its digits is 93312, while the sum is 42.

The square root of 216389166 is about 14710.1721947773. The cubic root of 216389166 is about 600.3601226984.

The spelling of 216389166 in words is "two hundred sixteen million, three hundred eighty-nine thousand, one hundred sixty-six".