216503166 has 32 divisors (see below), whose sum is σ = 473558400. Its totient is φ = 65442080.

The previous prime is 216503137. The next prime is 216503167. The reversal of 216503166 is 661305612.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216503167) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23740 + ... + 31568.

It is an arithmetic number, because the mean of its divisors is an integer number (14798700).

Almost surely, 2^216503166 is an apocalyptic number.

216503166 is an abundant number, since it is smaller than the sum of its proper divisors (257055234).

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

216503166 is a wasteful number, since it uses less digits than its factorization.

216503166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8264.

The product of its (nonzero) digits is 6480, while the sum is 30.

The square root of 216503166 is about 14714.0465542284. The cubic root of 216503166 is about 600.4655331492.

Adding to 216503166 its reverse (661305612), we get a palindrome (877808778).

The spelling of 216503166 in words is "two hundred sixteen million, five hundred three thousand, one hundred sixty-six".