216678966 has 16 divisors (see below), whose sum is σ = 495266304. Its totient is φ = 61908264.

The previous prime is 216678881. The next prime is 216678967. The reversal of 216678966 is 669876612.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216678967) 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 7 ways as a sum of consecutive naturals, for example, 2579470 + ... + 2579553.

It is an arithmetic number, because the mean of its divisors is an integer number (30954144).

Almost surely, 2^216678966 is an apocalyptic number.

216678966 is an abundant number, since it is smaller than the sum of its proper divisors (278587338).

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

216678966 is a wasteful number, since it uses less digits than its factorization.

216678966 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5159035.

The product of its digits is 1306368, while the sum is 51.

The square root of 216678966 is about 14720.0192255309. The cubic root of 216678966 is about 600.6280146555.

The spelling of 216678966 in words is "two hundred sixteen million, six hundred seventy-eight thousand, nine hundred sixty-six".