16688621999 has 16 divisors (see below), whose sum is σ = 20198046528. Its totient is φ = 13460815872.

The previous prime is 16688621977. The next prime is 16688622007. The reversal of 16688621999 is 99912688661.

It is a de Polignac number, because none of the positive numbers 2^k-16688621999 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16688621399) 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 15 ways as a sum of consecutive naturals, for example, 1373519 + ... + 1385615.

It is an arithmetic number, because the mean of its divisors is an integer number (1262377908).

Almost surely, 2^16688621999 is an apocalyptic number.

16688621999 is a deficient number, since it is larger than the sum of its proper divisors (3509424529).

16688621999 is a wasteful number, since it uses less digits than its factorization.

16688621999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23714.

The product of its digits is 20155392, while the sum is 65.

The spelling of 16688621999 in words is "sixteen billion, six hundred eighty-eight million, six hundred twenty-one thousand, nine hundred ninety-nine".