216665466 has 16 divisors (see below), whose sum is σ = 435927744. Its totient is φ = 71789024.

The previous prime is 216665461. The next prime is 216665509. The reversal of 216665466 is 664566612.

It is a happy number.

It is a super-3 number, since 3×216665466³ (a number of 26 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (216665461) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 107115 + ... + 109118.

It is an arithmetic number, because the mean of its divisors is an integer number (27245484).

Almost surely, 2^216665466 is an apocalyptic number.

216665466 is an abundant number, since it is smaller than the sum of its proper divisors (219262278).

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

216665466 is a wasteful number, since it uses less digits than its factorization.

216665466 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 216405.

The product of its digits is 311040, while the sum is 42.

The square root of 216665466 is about 14719.5606592045. The cubic root of 216665466 is about 600.6155405227.

The spelling of 216665466 in words is "two hundred sixteen million, six hundred sixty-five thousand, four hundred sixty-six".