216091766 has 32 divisors (see below), whose sum is σ = 368375040. Its totient is φ = 94197600.

The previous prime is 216091741. The next prime is 216091783. The reversal of 216091766 is 667190612.

216091766 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is a congruent number.

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, 55925 + ... + 59663.

It is an arithmetic number, because the mean of its divisors is an integer number (11511720).

Almost surely, 2^216091766 is an apocalyptic number.

216091766 is a deficient number, since it is larger than the sum of its proper divisors (152283274).

216091766 is a wasteful number, since it uses less digits than its factorization.

216091766 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3860.

The product of its (nonzero) digits is 27216, while the sum is 38.

The square root of 216091766 is about 14700.0600679045. The cubic root of 216091766 is about 600.0849564886.

The spelling of 216091766 in words is "two hundred sixteen million, ninety-one thousand, seven hundred sixty-six".