216706266 has 40 divisors (see below), whose sum is σ = 554954400. Its totient is φ = 61915752.

The previous prime is 216706247. The next prime is 216706289. The reversal of 216706266 is 662607612.

216706266 is a `hidden beast` number, since 21 + 6 + 7 + 0 + 626 + 6 = 666.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 216706266.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 94416 + ... + 96683.

It is an arithmetic number, because the mean of its divisors is an integer number (13873860).

Almost surely, 2^216706266 is an apocalyptic number.

216706266 is an abundant number, since it is smaller than the sum of its proper divisors (338248134).

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

216706266 is a wasteful number, since it uses less digits than its factorization.

216706266 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 191120 (or 191111 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 36.

The square root of 216706266 is about 14720.9465048957. The cubic root of 216706266 is about 600.6532385409.

The spelling of 216706266 in words is "two hundred sixteen million, seven hundred six thousand, two hundred sixty-six".