216966345 has 16 divisors (see below), whose sum is σ = 347560512. Its totient is φ = 115577280.

The previous prime is 216966331. The next prime is 216966367. The reversal of 216966345 is 543669612.

It is not a de Polignac number, because 216966345 - 2¹³ = 216958153 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 216966297 and 216966306.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5055 + ... + 21435.

It is an arithmetic number, because the mean of its divisors is an integer number (21722532).

Almost surely, 2^216966345 is an apocalyptic number.

It is an amenable number.

216966345 is a deficient number, since it is larger than the sum of its proper divisors (130594167).

216966345 is a wasteful number, since it uses less digits than its factorization.

216966345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17272.

The product of its digits is 233280, while the sum is 42.

The square root of 216966345 is about 14729.7774932278. Note that the first 3 decimals coincide. The cubic root of 216966345 is about 600.8934328581.

The spelling of 216966345 in words is "two hundred sixteen million, nine hundred sixty-six thousand, three hundred forty-five".