16718668369 has 8 divisors (see below), whose sum is σ = 18344432232. Its totient is φ = 15141434880.

The previous prime is 16718668367. The next prime is 16718668381. The reversal of 16718668369 is 96386681761.

It can be written as a sum of positive squares in 4 ways, for example, as 2264617744 + 14454050625 = 47588^2 + 120225^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 16718668369 - 2¹ = 16718668367 is a prime.

It is a super-2 number, since 2×16718668369² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16718668367) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12131872 + ... + 12133249.

It is an arithmetic number, because the mean of its divisors is an integer number (2293054029).

Almost surely, 2^16718668369 is an apocalyptic number.

It is an amenable number.

16718668369 is a deficient number, since it is larger than the sum of its proper divisors (1625763863).

16718668369 is a wasteful number, since it uses less digits than its factorization.

16718668369 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24265187.

The product of its digits is 15676416, while the sum is 61.

The spelling of 16718668369 in words is "sixteen billion, seven hundred eighteen million, six hundred sixty-eight thousand, three hundred sixty-nine".