216660544 has 28 divisors (see below), whose sum is σ = 435126384. Its totient is φ = 107022464.

The previous prime is 216660533. The next prime is 216660557. The reversal of 216660544 is 445066612.

216660544 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15082 + ... + 25705.

It is an arithmetic number, because the mean of its divisors is an integer number (15540228).

Almost surely, 2^216660544 is an apocalyptic number.

It is an amenable number.

216660544 is an abundant number, since it is smaller than the sum of its proper divisors (218465840).

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

216660544 is an equidigital number, since it uses as much as digits as its factorization.

216660544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40882 (or 40872 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 34.

The square root of 216660544 is about 14719.3934657648. The cubic root of 216660544 is about 600.6109924174.

The spelling of 216660544 in words is "two hundred sixteen million, six hundred sixty thousand, five hundred forty-four".