216405783088169 has 2 divisors, whose sum is σ = 216405783088170. Its totient is φ = 216405783088168.

The previous prime is 216405783088153. The next prime is 216405783088199. The reversal of 216405783088169 is 961880387504612.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 211273347210025 + 5132435878144 = 14535245^2 + 2265488^2 .

It is a cyclic number.

It is not a de Polignac number, because 216405783088169 - 2⁴ = 216405783088153 is a prime.

It is a super-2 number, since 2×216405783088169² (a number of 29 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 216405783088099 and 216405783088108.

It is not a weakly prime, because it can be changed into another prime (216405783088199) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108202891544084 + 108202891544085.

It is an arithmetic number, because the mean of its divisors is an integer number (108202891544085).

It is a 1-persistent number, because it is pandigital, but 2⋅216405783088169 = 432811566176338 is not.

Almost surely, 2^{216405783088169} is an apocalyptic number.

It is an amenable number.

216405783088169 is a deficient number, since it is larger than the sum of its proper divisors (1).

216405783088169 is an equidigital number, since it uses as much as digits as its factorization.

216405783088169 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 139345920, while the sum is 68.

The spelling of 216405783088169 in words is "two hundred sixteen trillion, four hundred five billion, seven hundred eighty-three million, eighty-eight thousand, one hundred sixty-nine".