216654066 has 72 divisors (see below), whose sum is σ = 500095596. Its totient is φ = 67763520.

The previous prime is 216654049. The next prime is 216654073. The reversal of 216654066 is 660456612.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 200081025 + 16573041 = 14145^2 + 4071^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 216654066.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 580656 + ... + 581028.

Almost surely, 2^216654066 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 216654066, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (250047798).

216654066 is an abundant number, since it is smaller than the sum of its proper divisors (283441530).

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

216654066 is a wasteful number, since it uses less digits than its factorization.

216654066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 488 (or 462 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 36.

The square root of 216654066 is about 14719.1734142920. The cubic root of 216654066 is about 600.6050064070.

The spelling of 216654066 in words is "two hundred sixteen million, six hundred fifty-four thousand, sixty-six".