216643715 has 8 divisors (see below), whose sum is σ = 260086560. Its totient is φ = 173238912.

The previous prime is 216643709. The next prime is 216643741. The reversal of 216643715 is 517346612.

216643715 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 216643715 - 2²² = 212449411 is a prime.

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, 5051 + ... + 21419.

It is an arithmetic number, because the mean of its divisors is an integer number (32510820).

Almost surely, 2^216643715 is an apocalyptic number.

216643715 is a deficient number, since it is larger than the sum of its proper divisors (43442845).

216643715 is a wasteful number, since it uses less digits than its factorization.

216643715 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19021.

The product of its digits is 30240, while the sum is 35.

The square root of 216643715 is about 14718.8217938801. The cubic root of 216643715 is about 600.5954412947.

The spelling of 216643715 in words is "two hundred sixteen million, six hundred forty-three thousand, seven hundred fifteen".