16191086818 has 16 divisors (see below), whose sum is σ = 24401629944. Its totient is φ = 8057301120.

The previous prime is 16191086783. The next prime is 16191086827. The reversal of 16191086818 is 81868019161.

It can be written as a sum of positive squares in 4 ways, for example, as 15246569529 + 944517289 = 123477^2 + 30733^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 340548 + ... + 385168.

Almost surely, 2^16191086818 is an apocalyptic number.

16191086818 is a deficient number, since it is larger than the sum of its proper divisors (8210543126).

16191086818 is a wasteful number, since it uses less digits than its factorization.

16191086818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45477.

The product of its (nonzero) digits is 165888, while the sum is 49.

The spelling of 16191086818 in words is "sixteen billion, one hundred ninety-one million, eighty-six thousand, eight hundred eighteen".