16385194866769 has 9 divisors (see below), whose sum is σ = 16472207618139. Its totient is φ = 16298639412240.

The previous prime is 16385194866727. The next prime is 16385194866809. The reversal of 16385194866769 is 96766849158361.

The square root of 16385194866769 is 4047863.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 553454163025 + 15831740703744 = 743945^2 + 3978912^2 .

It is not a de Polignac number, because 16385194866769 - 2⁷ = 16385194866641 is a prime.

It is a super-2 number, since 2×16385194866769² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16385194866569) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 773131237 + ... + 773152429.

Almost surely, 2^{16385194866769} is an apocalyptic number.

16385194866769 is the 4047863-rd square number.

16385194866769 is the 2023932-nd centered octagonal number.

It is an amenable number.

16385194866769 is a deficient number, since it is larger than the sum of its proper divisors (87012751370).

16385194866769 is an frugal number, since it uses more digits than its factorization.

16385194866769 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42768 (or 21384 counting only the distinct ones).

The product of its digits is 2821754880, while the sum is 79.

The spelling of 16385194866769 in words is "sixteen trillion, three hundred eighty-five billion, one hundred ninety-four million, eight hundred sixty-six thousand, seven hundred sixty-nine".