161330211 has 80 divisors (see below), whose sum is σ = 292723200. Its totient is φ = 86562432.

The previous prime is 161330201. The next prime is 161330233. The reversal of 161330211 is 112033161.

161330211 is a `hidden beast` number, since 1 + 613 + 30 + 21 + 1 = 666.

161330211 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 161330211 - 2⁹ = 161329699 is a prime.

It is not an unprimeable number, because it can be changed into a prime (161330201) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 1160580 + ... + 1160718.

It is an arithmetic number, because the mean of its divisors is an integer number (3659040).

Almost surely, 2^161330211 is an apocalyptic number.

161330211 is a deficient number, since it is larger than the sum of its proper divisors (131392989).

161330211 is a wasteful number, since it uses less digits than its factorization.

161330211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 270 (or 261 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

The square root of 161330211 is about 12701.5830115777. The cubic root of 161330211 is about 544.3838515549.

Adding to 161330211 its reverse (112033161), we get a palindrome (273363372).

The spelling of 161330211 in words is "one hundred sixty-one million, three hundred thirty thousand, two hundred eleven".