216645743 has 2 divisors, whose sum is σ = 216645744. Its totient is φ = 216645742.

The previous prime is 216645703. The next prime is 216645749. The reversal of 216645743 is 347546612.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 216645743 - 2¹⁴ = 216629359 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 216645697 and 216645706.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (216645749) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108322871 + 108322872.

It is an arithmetic number, because the mean of its divisors is an integer number (108322872).

Almost surely, 2^216645743 is an apocalyptic number.

216645743 is a deficient number, since it is larger than the sum of its proper divisors (1).

216645743 is an equidigital number, since it uses as much as digits as its factorization.

216645743 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 120960, while the sum is 38.

The square root of 216645743 is about 14718.8906851026. The cubic root of 216645743 is about 600.5973153452.

The spelling of 216645743 in words is "two hundred sixteen million, six hundred forty-five thousand, seven hundred forty-three".