216004646169 has 81 divisors (see below), whose sum is σ = 359408902359. Its totient is φ = 124928294400.

The previous prime is 216004646159. The next prime is 216004646189. The reversal of 216004646169 is 961646400612.

It is a happy number.

The square root of 216004646169 is 464763.

It is a perfect power (a square), and thus also a powerful number.

216004646169 is a `hidden beast` number, since 21 + 6 + 0 + 0 + 4 + 6 + 4 + 616 + 9 = 666.

It can be written as a sum of positive squares in 13 ways, for example, as 45204287769 + 170800358400 = 212613^2 + 413280^2 .

It is not a de Polignac number, because 216004646169 - 2¹⁵ = 216004613401 is a prime.

It is a super-2 number, since 2×216004646169² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (216004646159) by changing a digit.

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 80 ways as a sum of consecutive naturals, for example, 308137519 + ... + 308138219.

Almost surely, 2^216004646169 is an apocalyptic number.

216004646169 is the 464763-rd square number.

216004646169 is the 232382-nd centered octagonal number.

It is an amenable number.

216004646169 is a deficient number, since it is larger than the sum of its proper divisors (143404256190).

216004646169 is an equidigital number, since it uses as much as digits as its factorization.

216004646169 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1468 (or 734 counting only the distinct ones).

The product of its (nonzero) digits is 373248, while the sum is 45.

The spelling of 216004646169 in words is "two hundred sixteen billion, four million, six hundred forty-six thousand, one hundred sixty-nine".