16688574942191 has 4 divisors (see below), whose sum is σ = 17566920991800. Its totient is φ = 15810228892584.

The previous prime is 16688574942173. The next prime is 16688574942209. The reversal of 16688574942191 is 19124947588661.

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

It is an interprime number because it is at equal distance from previous prime (16688574942173) and next prime (16688574942209).

It is a de Polignac number, because none of the positive numbers 2^k-16688574942191 is a prime.

It is a super-2 number, since 2×16688574942191² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16688574942791) 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, 439173024776 + ... + 439173024813.

It is an arithmetic number, because the mean of its divisors is an integer number (4391730247950).

Almost surely, 2^{16688574942191} is an apocalyptic number.

16688574942191 is a deficient number, since it is larger than the sum of its proper divisors (878346049609).

16688574942191 is an equidigital number, since it uses as much as digits as its factorization.

16688574942191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 878346049608.

The product of its digits is 209018880, while the sum is 71.

The spelling of 16688574942191 in words is "sixteen trillion, six hundred eighty-eight billion, five hundred seventy-four million, nine hundred forty-two thousand, one hundred ninety-one".