216660445 has 8 divisors (see below), whose sum is σ = 266039136. Its totient is φ = 169297296.

The previous prime is 216660413. The next prime is 216660463. The reversal of 216660445 is 544066612.

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

It is a cyclic number.

It is not a de Polignac number, because 216660445 - 2⁵ = 216660413 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 216660445.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 503647 + ... + 504076.

It is an arithmetic number, because the mean of its divisors is an integer number (33254892).

Almost surely, 2^216660445 is an apocalyptic number.

It is an amenable number.

216660445 is a deficient number, since it is larger than the sum of its proper divisors (49378691).

216660445 is a wasteful number, since it uses less digits than its factorization.

216660445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1007771.

The product of its (nonzero) digits is 34560, while the sum is 34.

The square root of 216660445 is about 14719.3901028541. The cubic root of 216660445 is about 600.6109009371.

The spelling of 216660445 in words is "two hundred sixteen million, six hundred sixty thousand, four hundred forty-five".