16687686747 has 4 divisors (see below), whose sum is σ = 22250249000. Its totient is φ = 11125124496.

The previous prime is 16687686733. The next prime is 16687686749. The reversal of 16687686747 is 74768678661.

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

It is not a de Polignac number, because 16687686747 - 2¹⁶ = 16687621211 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16687686749) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2781281122 + ... + 2781281127.

It is an arithmetic number, because the mean of its divisors is an integer number (5562562250).

Almost surely, 2^16687686747 is an apocalyptic number.

16687686747 is a deficient number, since it is larger than the sum of its proper divisors (5562562253).

16687686747 is an equidigital number, since it uses as much as digits as its factorization.

16687686747 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5562562252.

The product of its digits is 113799168, while the sum is 66.

The spelling of 16687686747 in words is "sixteen billion, six hundred eighty-seven million, six hundred eighty-six thousand, seven hundred forty-seven".