216519663 has 16 divisors (see below), whose sum is σ = 295872896. Its totient is φ = 140767200.

The previous prime is 216519613. The next prime is 216519689. The reversal of 216519663 is 366915612.

It is a de Polignac number, because none of the positive numbers 2^k-216519663 is a prime.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216519613) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 134781 + ... + 136377.

It is an arithmetic number, because the mean of its divisors is an integer number (18492056).

Almost surely, 2^216519663 is an apocalyptic number.

216519663 is a deficient number, since it is larger than the sum of its proper divisors (79353233).

216519663 is a wasteful number, since it uses less digits than its factorization.

216519663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2694.

The product of its digits is 58320, while the sum is 39.

The square root of 216519663 is about 14714.6071303314. The cubic root of 216519663 is about 600.4807840860.

The spelling of 216519663 in words is "two hundred sixteen million, five hundred nineteen thousand, six hundred sixty-three".