216523660 has 12 divisors (see below), whose sum is σ = 454699728. Its totient is φ = 86609456.

The previous prime is 216523651. The next prime is 216523661. The reversal of 216523660 is 66325612.

It is a zygodrome in base 2.

It is not an unprimeable number, because it can be changed into a prime (216523661) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5413072 + ... + 5413111.

It is an arithmetic number, because the mean of its divisors is an integer number (37891644).

Almost surely, 2^216523660 is an apocalyptic number.

216523660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

216523660 is an abundant number, since it is smaller than the sum of its proper divisors (238176068).

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

216523660 is a wasteful number, since it uses less digits than its factorization.

216523660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10826192 (or 10826190 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 31.

The square root of 216523660 is about 14714.7429471262. The cubic root of 216523660 is about 600.4844790651.

The spelling of 216523660 in words is "two hundred sixteen million, five hundred twenty-three thousand, six hundred sixty".