216598663 has 2 divisors, whose sum is σ = 216598664. Its totient is φ = 216598662.

The previous prime is 216598661. The next prime is 216598667. The reversal of 216598663 is 366895612.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 216598663 - 2¹ = 216598661 is a prime.

Together with 216598661, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (216598661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108299331 + 108299332.

It is an arithmetic number, because the mean of its divisors is an integer number (108299332).

Almost surely, 2^216598663 is an apocalyptic number.

216598663 is a deficient number, since it is larger than the sum of its proper divisors (1).

216598663 is an equidigital number, since it uses as much as digits as its factorization.

216598663 is an evil number, because the sum of its binary digits is even.

The product of its digits is 466560, while the sum is 46.

The square root of 216598663 is about 14717.2912928976. The cubic root of 216598663 is about 600.5538062664.

The spelling of 216598663 in words is "two hundred sixteen million, five hundred ninety-eight thousand, six hundred sixty-three".