217384610066 has 16 divisors (see below), whose sum is σ = 352942299864. Its totient is φ = 99822059904.

The previous prime is 217384610057. The next prime is 217384610071. The reversal of 217384610066 is 660016483712.

It can be written as a sum of positive squares in 4 ways, for example, as 156634684441 + 60749925625 = 395771^2 + 246475^2 .

It is a junction number, because it is equal to n+sod(n) for n = 217384609999 and 217384610026.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21215555 + ... + 21225798.

Almost surely, 2^217384610066 is an apocalyptic number.

217384610066 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

217384610066 is a deficient number, since it is larger than the sum of its proper divisors (135557689798).

217384610066 is a wasteful number, since it uses less digits than its factorization.

217384610066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42441565.

The product of its (nonzero) digits is 290304, while the sum is 44.

The spelling of 217384610066 in words is "two hundred seventeen billion, three hundred eighty-four million, six hundred ten thousand, sixty-six".