216546660 has 72 divisors (see below), whose sum is σ = 716579136. Its totient is φ = 52495680.

The previous prime is 216546647. The next prime is 216546677. The reversal of 216546660 is 66645612.

It is a happy number.

216546660 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 52704 + ... + 56663.

It is an arithmetic number, because the mean of its divisors is an integer number (9952488).

Almost surely, 2^216546660 is an apocalyptic number.

216546660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

216546660 is an abundant number, since it is smaller than the sum of its proper divisors (500032476).

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

216546660 is a wasteful number, since it uses less digits than its factorization.

216546660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109393 (or 109388 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 36.

The square root of 216546660 is about 14715.5244554858. The cubic root of 216546660 is about 600.5057402582.

The spelling of 216546660 in words is "two hundred sixteen million, five hundred forty-six thousand, six hundred sixty".