216776699 has 2 divisors, whose sum is σ = 216776700. Its totient is φ = 216776698.

The previous prime is 216776669. The next prime is 216776723. The reversal of 216776699 is 996677612.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 216776699 - 2¹⁶ = 216711163 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 216776699.

It is not a weakly prime, because it can be changed into another prime (216776669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108388349 + 108388350.

It is an arithmetic number, because the mean of its divisors is an integer number (108388350).

Almost surely, 2^216776699 is an apocalyptic number.

216776699 is a deficient number, since it is larger than the sum of its proper divisors (1).

216776699 is an equidigital number, since it uses as much as digits as its factorization.

216776699 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1714608, while the sum is 53.

The square root of 216776699 is about 14723.3385819929. The cubic root of 216776699 is about 600.7183054597.

The spelling of 216776699 in words is "two hundred sixteen million, seven hundred seventy-six thousand, six hundred ninety-nine".