216186491698 has 16 divisors (see below), whose sum is σ = 333111645720. Its totient is φ = 105150462336.

The previous prime is 216186491687. The next prime is 216186491711. The reversal of 216186491698 is 896194681612.

It can be written as a sum of positive squares in 4 ways, for example, as 214356962169 + 1829529529 = 462987^2 + 42773^2 .

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, 73740 + ... + 661672.

Almost surely, 2^216186491698 is an apocalyptic number.

216186491698 is a deficient number, since it is larger than the sum of its proper divisors (116925154022).

216186491698 is a wasteful number, since it uses less digits than its factorization.

216186491698 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 592941.

The product of its digits is 8957952, while the sum is 61.

The spelling of 216186491698 in words is "two hundred sixteen billion, one hundred eighty-six million, four hundred ninety-one thousand, six hundred ninety-eight".