16681206686 has 4 divisors (see below), whose sum is σ = 25021810032. Its totient is φ = 8340603342.

The previous prime is 16681206653. The next prime is 16681206709. The reversal of 16681206686 is 68660218661.

16681206686 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×16681206686² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

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 as a sum of consecutive naturals, namely, 4170301670 + ... + 4170301673.

It is an arithmetic number, because the mean of its divisors is an integer number (6255452508).

Almost surely, 2^16681206686 is an apocalyptic number.

16681206686 is a deficient number, since it is larger than the sum of its proper divisors (8340603346).

16681206686 is an equidigital number, since it uses as much as digits as its factorization.

16681206686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8340603345.

The product of its (nonzero) digits is 995328, while the sum is 50.

The spelling of 16681206686 in words is "sixteen billion, six hundred eighty-one million, two hundred six thousand, six hundred eighty-six".