216533166 has 8 divisors (see below), whose sum is σ = 433066344. Its totient is φ = 72177720.

The previous prime is 216533159. The next prime is 216533167. The reversal of 216533166 is 661335612.

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

216533166 is an admirable number.

It is a super-2 number, since 2×216533166² = 93773223955967112, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216533167) 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, 18044425 + ... + 18044436.

It is an arithmetic number, because the mean of its divisors is an integer number (54133293).

Almost surely, 2^216533166 is an apocalyptic number.

216533166 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

216533166 is a wasteful number, since it uses less digits than its factorization.

216533166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36088866.

The product of its digits is 19440, while the sum is 33.

The square root of 216533166 is about 14715.0659529613. The cubic root of 216533166 is about 600.4932665912.

Adding to 216533166 its reverse (661335612), we get a palindrome (877868778).

The spelling of 216533166 in words is "two hundred sixteen million, five hundred thirty-three thousand, one hundred sixty-six".