161766339709 has 4 divisors (see below), whose sum is σ = 174209904316. Its totient is φ = 149322775104.

The previous prime is 161766339667. The next prime is 161766339733. The reversal of 161766339709 is 907933667161.

161766339709 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 50341896900 + 111424442809 = 224370^2 + 333803^2 .

It is a cyclic number.

It is not a de Polignac number, because 161766339709 - 2²³ = 161757951101 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161766339209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6221782284 + ... + 6221782309.

It is an arithmetic number, because the mean of its divisors is an integer number (43552476079).

Almost surely, 2^161766339709 is an apocalyptic number.

It is an amenable number.

161766339709 is a deficient number, since it is larger than the sum of its proper divisors (12443564607).

161766339709 is a wasteful number, since it uses less digits than its factorization.

161766339709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12443564606.

The product of its (nonzero) digits is 7715736, while the sum is 58.

The spelling of 161766339709 in words is "one hundred sixty-one billion, seven hundred sixty-six million, three hundred thirty-nine thousand, seven hundred nine".