216503066 has 16 divisors (see below), whose sum is σ = 351285984. Its totient is φ = 99481584.

The previous prime is 216503057. The next prime is 216503087. The reversal of 216503066 is 660305612.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12440 + ... + 24243.

It is an arithmetic number, because the mean of its divisors is an integer number (21955374).

Almost surely, 2^216503066 is an apocalyptic number.

216503066 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

216503066 is a deficient number, since it is larger than the sum of its proper divisors (134782918).

216503066 is a wasteful number, since it uses less digits than its factorization.

216503066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36925.

The product of its (nonzero) digits is 6480, while the sum is 29.

The square root of 216503066 is about 14714.0431561145. The cubic root of 216503066 is about 600.4654407001.

Adding to 216503066 its reverse (660305612), we get a palindrome (876808678).

The spelling of 216503066 in words is "two hundred sixteen million, five hundred three thousand, sixty-six".