216681433 has 8 divisors (see below), whose sum is σ = 222173280. Its totient is φ = 211199520.

The previous prime is 216681419. The next prime is 216681457. The reversal of 216681433 is 334186612.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-216681433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216681733) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 63066 + ... + 66412.

It is an arithmetic number, because the mean of its divisors is an integer number (27771660).

Almost surely, 2^216681433 is an apocalyptic number.

It is an amenable number.

216681433 is a deficient number, since it is larger than the sum of its proper divisors (5491847).

216681433 is a wasteful number, since it uses less digits than its factorization.

216681433 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4967.

The product of its digits is 20736, while the sum is 34.

The square root of 216681433 is about 14720.1030227373. The cubic root of 216681433 is about 600.6302941318.

The spelling of 216681433 in words is "two hundred sixteen million, six hundred eighty-one thousand, four hundred thirty-three".