16865957161 has 9 divisors (see below), whose sum is σ = 17155038693. Its totient is φ = 16581673920.

The previous prime is 16865957153. The next prime is 16865957167. The reversal of 16865957161 is 16175956861.

The square root of 16865957161 is 129869.

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

16865957161 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 9725707161 + 7140250000 = 98619^2 + 84500^2 .

It is not a de Polignac number, because 16865957161 - 2³ = 16865957153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16865957167) 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 8 ways as a sum of consecutive naturals, for example, 7920945 + ... + 7923073.

Almost surely, 2^16865957161 is an apocalyptic number.

16865957161 is the 129869-th square number.

16865957161 is the 64935-th centered octagonal number.

It is an amenable number.

16865957161 is a deficient number, since it is larger than the sum of its proper divisors (289081532).

16865957161 is an frugal number, since it uses more digits than its factorization.

16865957161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4380 (or 2190 counting only the distinct ones).

The product of its digits is 2721600, while the sum is 55.

The spelling of 16865957161 in words is "sixteen billion, eight hundred sixty-five million, nine hundred fifty-seven thousand, one hundred sixty-one".