16681918345924 has 24 divisors (see below), whose sum is σ = 32107914857088. Its totient is φ = 7535531035680.

The previous prime is 16681918345921. The next prime is 16681918345943. The reversal of 16681918345924 is 42954381918661.

It is a self number, because there is not a number n which added to its sum of digits gives 16681918345924.

It is not an unprimeable number, because it can be changed into a prime (16681918345921) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3412828642 + ... + 3412833529.

It is an arithmetic number, because the mean of its divisors is an integer number (1337829785712).

Almost surely, 2^{16681918345924} is an apocalyptic number.

It is an amenable number.

16681918345924 is a deficient number, since it is larger than the sum of its proper divisors (15425996511164).

16681918345924 is a wasteful number, since it uses less digits than its factorization.

16681918345924 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6825662235 (or 6825662233 counting only the distinct ones).

The product of its digits is 89579520, while the sum is 67.

The spelling of 16681918345924 in words is "sixteen trillion, six hundred eighty-one billion, nine hundred eighteen million, three hundred forty-five thousand, nine hundred twenty-four".