16385805761 has 4 divisors (see below), whose sum is σ = 17646252372. Its totient is φ = 15125359152.

The previous prime is 16385805757. The next prime is 16385805833. The reversal of 16385805761 is 16750858361.

It is a happy number.

16385805761 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in 2 ways, for example, as 9014553025 + 7371252736 = 94945^2 + 85856^2 .

It is a cyclic number.

It is not a de Polignac number, because 16385805761 - 2² = 16385805757 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16385807761) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 630223286 + ... + 630223311.

It is an arithmetic number, because the mean of its divisors is an integer number (4411563093).

Almost surely, 2^16385805761 is an apocalyptic number.

It is an amenable number.

16385805761 is a deficient number, since it is larger than the sum of its proper divisors (1260446611).

16385805761 is a wasteful number, since it uses less digits than its factorization.

16385805761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1260446610.

The product of its (nonzero) digits is 1209600, while the sum is 50.

The spelling of 16385805761 in words is "sixteen billion, three hundred eighty-five million, eight hundred five thousand, seven hundred sixty-one".