216633266 has 4 divisors (see below), whose sum is σ = 324949902. Its totient is φ = 108316632.

The previous prime is 216633233. The next prime is 216633271. The reversal of 216633266 is 662336612.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 118048225 + 98585041 = 10865^2 + 9929^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54158315 + ... + 54158318.

Almost surely, 2^216633266 is an apocalyptic number.

216633266 is a deficient number, since it is larger than the sum of its proper divisors (108316636).

216633266 is a wasteful number, since it uses less digits than its factorization.

216633266 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108316635.

The product of its digits is 46656, while the sum is 35.

The square root of 216633266 is about 14718.4668359174. The cubic root of 216633266 is about 600.5857853139.

Adding to 216633266 its reverse (662336612), we get a palindrome (878969878).

The spelling of 216633266 in words is "two hundred sixteen million, six hundred thirty-three thousand, two hundred sixty-six".