216502066 has 16 divisors (see below), whose sum is σ = 356659200. Its totient is φ = 97748080.

The previous prime is 216502063. The next prime is 216502067. The reversal of 216502066 is 660205612.

It is not an unprimeable number, because it can be changed into a prime (216502063) 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, 29746 + ... + 36301.

It is an arithmetic number, because the mean of its divisors is an integer number (22291200).

Almost surely, 2^216502066 is an apocalyptic number.

216502066 is a deficient number, since it is larger than the sum of its proper divisors (140157134).

216502066 is a wasteful number, since it uses less digits than its factorization.

216502066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66209.

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 216502066 is about 14714.0091749326. The cubic root of 216502066 is about 600.4645162076.

Adding to 216502066 its reverse (660205612), we get a palindrome (876707678).

It can be divided in two parts, 21650 and 2066, that added together give a square (23716 = 154²).

The spelling of 216502066 in words is "two hundred sixteen million, five hundred two thousand, sixty-six".