216443953 has 24 divisors (see below), whose sum is σ = 258594560. Its totient is φ = 180338400.

The previous prime is 216443947. The next prime is 216443959. The reversal of 216443953 is 359344612.

216443953 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (216443947) and next prime (216443959).

It is not a de Polignac number, because 216443953 - 2¹⁷ = 216312881 is a prime.

It is not an unprimeable number, because it can be changed into a prime (216443959) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 69751 + ... + 72787.

Almost surely, 2^216443953 is an apocalyptic number.

It is an amenable number.

216443953 is a deficient number, since it is larger than the sum of its proper divisors (42150607).

216443953 is a wasteful number, since it uses less digits than its factorization.

216443953 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3109 (or 3098 counting only the distinct ones).

The product of its digits is 77760, while the sum is 37.

The square root of 216443953 is about 14712.0342916947. The cubic root of 216443953 is about 600.4107862861.

The spelling of 216443953 in words is "two hundred sixteen million, four hundred forty-three thousand, nine hundred fifty-three".