216615066 has 16 divisors (see below), whose sum is σ = 433531488. Its totient is φ = 72154800.

The previous prime is 216615059. The next prime is 216615083. The reversal of 216615066 is 660516612.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2605 + ... + 20976.

It is an arithmetic number, because the mean of its divisors is an integer number (27095718).

Almost surely, 2^216615066 is an apocalyptic number.

216615066 is an abundant number, since it is smaller than the sum of its proper divisors (216916422).

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

216615066 is a wasteful number, since it uses less digits than its factorization.

216615066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25117.

The product of its (nonzero) digits is 12960, while the sum is 33.

The square root of 216615066 is about 14717.8485520133. The cubic root of 216615066 is about 600.5689658481.

The spelling of 216615066 in words is "two hundred sixteen million, six hundred fifteen thousand, sixty-six".