216653 has 2 divisors, whose sum is σ = 216654. Its totient is φ = 216652.

The previous prime is 216649. The next prime is 216661. The reversal of 216653 is 356612.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 209764 + 6889 = 458^2 + 83^2 .

It is a cyclic number.

It is not a de Polignac number, because 216653 - 2² = 216649 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (216553) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108326 + 108327.

It is an arithmetic number, because the mean of its divisors is an integer number (108327).

2²¹⁶⁶⁵³ is an apocalyptic number.

It is an amenable number.

216653 is a deficient number, since it is larger than the sum of its proper divisors (1).

216653 is an equidigital number, since it uses as much as digits as its factorization.

216653 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1080, while the sum is 23.

The square root of 216653 is about 465.4599875392. The cubic root of 216653 is about 60.0604021356.

The spelling of 216653 in words is "two hundred sixteen thousand, six hundred fifty-three".