16688540851 has 4 divisors (see below), whose sum is σ = 16688804112. Its totient is φ = 16688277592.

The previous prime is 16688540849. The next prime is 16688540867. The reversal of 16688540851 is 15804588661.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 16688540851 - 2¹ = 16688540849 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16688540801) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27930 + ... + 184816.

It is an arithmetic number, because the mean of its divisors is an integer number (4172201028).

Almost surely, 2^16688540851 is an apocalyptic number.

16688540851 is a deficient number, since it is larger than the sum of its proper divisors (263261).

16688540851 is a wasteful number, since it uses less digits than its factorization.

16688540851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 263260.

The product of its (nonzero) digits is 1843200, while the sum is 52.

The spelling of 16688540851 in words is "sixteen billion, six hundred eighty-eight million, five hundred forty thousand, eight hundred fifty-one".