216666112 has 78 divisors (see below), whose sum is σ = 470671242. Its totient is φ = 99680256.

The previous prime is 216666103. The next prime is 216666137. The reversal of 216666112 is 211666612.

It can be written as a sum of positive squares in 3 ways, for example, as 25563136 + 191102976 = 5056^2 + 13824^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 692068 + ... + 692380.

Almost surely, 2^216666112 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 216666112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (235335621).

216666112 is an abundant number, since it is smaller than the sum of its proper divisors (254005130).

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

216666112 is an equidigital number, since it uses as much as digits as its factorization.

216666112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 363 (or 328 counting only the distinct ones).

The product of its digits is 5184, while the sum is 31.

The square root of 216666112 is about 14719.5826027778. The cubic root of 216666112 is about 600.6161374449.

The spelling of 216666112 in words is "two hundred sixteen million, six hundred sixty-six thousand, one hundred twelve".