216666596 has 12 divisors (see below), whose sum is σ = 381935148. Its totient is φ = 107542272.

The previous prime is 216666589. The next prime is 216666599. The reversal of 216666596 is 695666612.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 101404900 + 115261696 = 10070^2 + 10736^2 .

It is a hoax number, since the sum of its digits (47) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 216666596.

It is not an unprimeable number, because it can be changed into a prime (216666599) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 197141 + ... + 198236.

It is an arithmetic number, because the mean of its divisors is an integer number (31827929).

Almost surely, 2^216666596 is an apocalyptic number.

It is an amenable number.

216666596 is a deficient number, since it is larger than the sum of its proper divisors (165268552).

216666596 is a wasteful number, since it uses less digits than its factorization.

216666596 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 395518 (or 395516 counting only the distinct ones).

The product of its digits is 699840, while the sum is 47.

The square root of 216666596 is about 14719.5990434522. The cubic root of 216666596 is about 600.6165846737.

The spelling of 216666596 in words is "two hundred sixteen million, six hundred sixty-six thousand, five hundred ninety-six".