16687344161 has 6 divisors (see below), whose sum is σ = 16876074870. Its totient is φ = 16498640928.

The previous prime is 16687344131. The next prime is 16687344221. The reversal of 16687344161 is 16144378661.

It can be written as a sum of positive squares in 3 ways, for example, as 11478979600 + 5208364561 = 107140^2 + 72169^2 .

It is not a de Polignac number, because 16687344161 - 2¹⁴ = 16687327777 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (16687344101) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1211831 + ... + 1225523.

It is an arithmetic number, because the mean of its divisors is an integer number (2812679145).

Almost surely, 2^16687344161 is an apocalyptic number.

It is an amenable number.

16687344161 is a deficient number, since it is larger than the sum of its proper divisors (188730709).

16687344161 is an frugal number, since it uses more digits than its factorization.

16687344161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27475 (or 13782 counting only the distinct ones).

The product of its digits is 580608, while the sum is 47.

The spelling of 16687344161 in words is "sixteen billion, six hundred eighty-seven million, three hundred forty-four thousand, one hundred sixty-one".