216949933997 has 2 divisors, whose sum is σ = 216949933998. Its totient is φ = 216949933996.

The previous prime is 216949933979. The next prime is 216949933999. The reversal of 216949933997 is 799339949612.

216949933997 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

Together with previous prime (216949933979) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 110317643881 + 106632290116 = 332141^2 + 326546^2 .

It is a cyclic number.

It is not a de Polignac number, because 216949933997 - 2⁸ = 216949933741 is a prime.

It is a super-2 number, since 2×216949933997² (a number of 23 digits) contains 22 as substring.

Together with 216949933999, it forms a pair of twin primes.

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 216949933997.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (216949933999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108474966998 + 108474966999.

It is an arithmetic number, because the mean of its divisors is an integer number (108474966999).

Almost surely, 2^216949933997 is an apocalyptic number.

It is an amenable number.

216949933997 is a deficient number, since it is larger than the sum of its proper divisors (1).

216949933997 is an equidigital number, since it uses as much as digits as its factorization.

216949933997 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 178564176, while the sum is 71.

The spelling of 216949933997 in words is "two hundred sixteen billion, nine hundred forty-nine million, nine hundred thirty-three thousand, nine hundred ninety-seven".