216204126985 has 16 divisors (see below), whose sum is σ = 323463837312. Its totient is φ = 134776598400.

The previous prime is 216204126977. The next prime is 216204127057. The reversal of 216204126985 is 589621402612.

It is not a de Polignac number, because 216204126985 - 2³ = 216204126977 is a prime.

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 15 ways as a sum of consecutive naturals, for example, 280784196 + ... + 280784965.

It is an arithmetic number, because the mean of its divisors is an integer number (20216489832).

Almost surely, 2^216204126985 is an apocalyptic number.

It is an amenable number.

216204126985 is a deficient number, since it is larger than the sum of its proper divisors (107259710327).

216204126985 is a wasteful number, since it uses less digits than its factorization.

216204126985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 561569184.

The product of its (nonzero) digits is 414720, while the sum is 46.

The spelling of 216204126985 in words is "two hundred sixteen billion, two hundred four million, one hundred twenty-six thousand, nine hundred eighty-five".