216345663 has 12 divisors (see below), whose sum is σ = 313521208. Its totient is φ = 143758800.

The previous prime is 216345637. The next prime is 216345667. The reversal of 216345663 is 366543612.

It is not a de Polignac number, because 216345663 - 2⁵ = 216345631 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216345667) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 36388 + ... + 41913.

Almost surely, 2^216345663 is an apocalyptic number.

216345663 is a deficient number, since it is larger than the sum of its proper divisors (97175545).

216345663 is a wasteful number, since it uses less digits than its factorization.

216345663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78614 (or 78611 counting only the distinct ones).

The product of its digits is 77760, while the sum is 36.

The square root of 216345663 is about 14708.6934497936. The cubic root of 216345663 is about 600.3198877561.

The spelling of 216345663 in words is "two hundred sixteen million, three hundred forty-five thousand, six hundred sixty-three".