216666 has 12 divisors (see below), whose sum is σ = 469482. Its totient is φ = 72216.
The previous prime is 216661. The next prime is 216679. The reversal of 216666 is 666612.
It can be written as a sum of positive squares in only one way, i.e., 216225 + 441 = 465^2 + 21^2 .
It is a nude number because it is divisible by every one of its digits.
216666 is a modest number, since divided by 666 gives 216 as remainder.
It is not an unprimeable number, because it can be changed into a prime (216661) by changing a digit.
It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6001 + ... + 6036.
2216666 is an apocalyptic number.
216666 is an abundant number, since it is smaller than the sum of its proper divisors (252816).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
216666 is a wasteful number, since it uses less digits than its factorization.
216666 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 12045 (or 12042 counting only the distinct ones).
The product of its digits is 2592, while the sum is 27.
The square root of 216666 is about 465.4739520102. The cubic root of 216666 is about 60.0616033954.
The spelling of 216666 in words is "two hundred sixteen thousand, six hundred sixty-six".
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