216065616 has 40 divisors (see below), whose sum is σ = 601107360. Its totient is φ = 66481536.

The previous prime is 216065579. The next prime is 216065621. The reversal of 216065616 is 616560612.

It is a congruent number.

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, 172506 + ... + 173753.

It is an arithmetic number, because the mean of its divisors is an integer number (15027684).

Almost surely, 2^216065616 is an apocalyptic number.

216065616 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

216065616 is an abundant number, since it is smaller than the sum of its proper divisors (385041744).

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

216065616 is a wasteful number, since it uses less digits than its factorization.

216065616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 346283 (or 346277 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 33.

The square root of 216065616 is about 14699.1705888462. The cubic root of 216065616 is about 600.0607494045.

It can be divided in two parts, 2160 and 65616, that added together give a palindrome (67776).

The spelling of 216065616 in words is "two hundred sixteen million, sixty-five thousand, six hundred sixteen".