16181516866 has 8 divisors (see below), whose sum is σ = 24272817084. Its totient is φ = 8090577840.

The previous prime is 16181516849. The next prime is 16181516887. The reversal of 16181516866 is 66861518161.

It is a happy number.

16181516866 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 15904993225 + 276523641 = 126115^2 + 16629^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

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 3 ways as a sum of consecutive naturals, for example, 115636 + ... + 213856.

Almost surely, 2^16181516866 is an apocalyptic number.

16181516866 is a deficient number, since it is larger than the sum of its proper divisors (8091300218).

16181516866 is an equidigital number, since it uses as much as digits as its factorization.

16181516866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 180596.

The product of its digits is 414720, while the sum is 49.

The spelling of 16181516866 in words is "sixteen billion, one hundred eighty-one million, five hundred sixteen thousand, eight hundred sixty-six".