216985266 has 24 divisors (see below), whose sum is σ = 490576320. Its totient is φ = 69183576.

The previous prime is 216985261. The next prime is 216985283. The reversal of 216985266 is 662589612.

216985266 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×216985266² = 94165211322181512, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (216985261) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 261646 + ... + 262473.

It is an arithmetic number, because the mean of its divisors is an integer number (20440680).

Almost surely, 2^216985266 is an apocalyptic number.

216985266 is an abundant number, since it is smaller than the sum of its proper divisors (273591054).

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

216985266 is a wasteful number, since it uses less digits than its factorization.

216985266 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 524150 (or 524147 counting only the distinct ones).

The product of its digits is 311040, while the sum is 45.

The square root of 216985266 is about 14730.4197496202. The cubic root of 216985266 is about 600.9108997363.

The spelling of 216985266 in words is "two hundred sixteen million, nine hundred eighty-five thousand, two hundred sixty-six".